GIFT  OF 


No.  1711 


INSTRUCTIONS  FOR  MOUNTING, 
USING,  AND  CARING  FOR 

DISAPPEARING  CARRIAGE 

L.  F.,  MODEL  OF  1905  Mil 

AND 

6-INCH  GUNS 

MODELS  OF  1905  AND  1908 


{EIGHT  PLATES) 


JANUARY  14,  1914 


WASHINGTON 

GOVERNMENT  PRINTING  OFFICE 

1917 


No.  1711 


INSTRUCTIONS  FOR  MOUNTING, 
USING,  AND  CARING  FOR 

DISAPPEARING  CARRIAGE 

L.  F.,  MODEL  OF  1905  Mil 

AND 

6-INCH  GUNS 

MODELS  OF  1905  AND  1908 


{EIGHT  PLATES) 


[  '  ■  ^  '        ^-    ^^•'y>- advice     cslepi.   , 
JANUARY  14,  1914 


WASHINGTON 

GOVERNMENT  PRINTING  OFFICE 

1917 


i       '    «      ^»    ,>'    ,,w,  •^••S 


TABLE  OF  CONTENTS. 


Page. 

List  of  plates 5 

General  description 7 

Emplacement 7 

Carriage 7 

Action  of  carriage 8 

Principal  parts 8 

Base  ring , 8 

Traversing  roller  system 8 

Racer 9 

Dust  guards 9 

Azimuth  circle  and  pointer 9 

Chassis  and  transoms 10 

Vertical  guides 10 

Top  carriage 10 

Recoil  rollers  and  roller  cages 11 

Counter-recoil  buffers 11 

Buffer  valve 12 

Gun  levers  and  axle 14 

Crosshead  and  counterweight 14 

Recoil  sylstem 16 

Retracting  system 18 

Retracting  clutch  and  brake 19 

Tripping  gear 20 

Elevating  system 20 

Traversing  system : 22 

Sighting  platforms 24 

Sight 24 

Electrical  equipment 24 

Lighting  circuits 25 

Firing  circuits 25 

Shot  trucks 27 

Shot  tongs 27 

Grease  cup 27 

Implements 27 

Instructions  for  asembling  the  carriage 28 

General  remarks 28 

Instructions  for  assembling 29 

Base  ring 29 

Leveling 29 

Distance  ring  and  traversing  rollers 29 

Racer 29 

Front  clips 30 

Chassis  and  guide  frames. . : 30 

Piston-rod  beam 30 

Vertical  guides 30 

Front  and  rear  transoms 30 

Bottom  plate 30 

(3) 


Instructions  for  assembling  the  carriage— Continued.  Page. 

Recoil  cylinder 30 

Counterweight 30 

Crosshead 30 

Retracting  and  tripping  gear 30 

Piston  rod  and  upper  cylinder  head 30 

Counter-recoil  buffers  and  roller  cages 30 

Top  carriage 30 

Gun  levers 30 

Gun  with  elevating  band " 30 

Important  points ^ 31 

Care  of  carriage '; 32 

General  instructions ^i 32 

Cleaning  hydraulic  cylinders 32 

Removing  packing  from  stuffing  boxes. ..1. 33 

Repacking  stuffing  boxes V 34 

Filling  cylinders : 34 

Service  condition  (lubrication,  etc.) 34 

Condition  "in  ordinary  " 35 

Oil  holes 36 

Compression  grease  cups 36 

Oils  and  grease 36 

Painting 37 

List  of  implements  furnished  for  6-inch  gun,  models  of  1905  and  1908 37 

Annual  allowances  of  material  for  cleaning  and  preservation 37 

List  of  articles  packed  in  armament  chest 37 

Names  of  parts,  location,  and  material 39 


LIST  OF  PLATES. 


Plate  No.  Drawing  No. 

I.  Platform 15-7K-1 

II.  Longitudinal  section 7-15-2 

III.  Assembled  views : .  7-15-2 

IV.  Assembled  mechanism 7-15-3 

V.  Recoil  cylinder  and  valve 15-0-18 

VI.  Electrical  equipment 7-15-22 

VII.  Electrical  equipment 7-15-23 

VIII.  Wiring  diagram ; 7-15-24 

(5) 


Digitized  by  the  Internet  Archive 

in  2007  with  funding  from 

IVIicrosoft  Corporation 


http://www.archive.org/details/disappearcarriaOOunitrich 


INSTRUCTIONS 

FOB 


MOUNTING,  USING,  AND  CARING  FOR  DISAPPEARING  CARRIAGE,  L  F. 
MODEL  OF  1905,  Mil  AND  6-INCH  GUNS,  MODELS  OF  1905  AND  1908. 


(Eight  plates.) 


(The  parts  in  italics  are  of  particular  importance  or  concern  the  safety  of  the  carriage 
and  should  be  specially  noted.) 


GENERAL  DESCRIPTION. 

The  Emplacement  (Plate  I). — Emplacements  for  these  carriages 
are  entirely  of  concrete,  and  can  be  arranged  for  a  maximum  field 
of  fire  of  170°.  This  limitation  is  not  due  to  the  inability  of  the  car- 
riage to  traverse  through  360°,  but  to  the  requirements  of  parapet  pro- 
tection for  the  material  and  cannoneers.  The  anchor  bolts  are  set  in 
the  concrete  during  the  construction  of  the  emplacement,  the  depres- 
sions for  the  thrust  plates  being  also  provided  in  the  top  surface. 
Access  to  the  counterweight  well  is  given  by  a  vertical  shaft  in  the 
rear  and  outside  of  the  base  ring. 

The  Carriage  (Plates  II,  III,  IV). — These  carriages  are  num- 
bered from  No.  20  up;  they  differ  from  models  of  earher  dates  for 
mounting  the  same  cahber  guns  chiefly  in  having  the  following 
features,  viz,  a  single  vertical  recoil  cylinder,  increased  preponderance 
of  counterweight,  a  counter-recoil  system  independent  of  the  recoil 
system,  gears  on  the  recoil  roUers. 

Stops  can  be  arranged  so  as  to  permit  traversing  either  60,  70,  90, 
or  110°  either  side  of  the  ^^ front"  of  the  battery,  and  the  piece  can 
be  elevated  from  5°  depression  to  15°  elevation,  stops  being  arranged 
to  limit  the  depression  to  either  horizontal  or  2.5°  when  the  height 
of  the  parapet  requires  it. 

When,  in  the  execution  of  mechanical  maneuvers,  it  may  become 
necessary  to  traverse  the  piece  breech  to  the  front,  which  can  be  done 
with  the  gun  in  battery,  the  fixed  stops  must  be  removed  and  care 
exercised  that  the  weights  do  not  foul  the  flexible  conduit  in  the  pit 
and  that  the  carriage  is  traversed  back  to  the  same  side  so  as  to  take 
out  the  half  turn  given  by  the  breech  to  the  front. 

(7) 


The  elevating  system  is  so  constructed  that  the  gun  is  at  an  angle 
of  about  5°  elevation  when  recoiled  to  the  loading  position  from  any 
angle  of  elevation  in  battery. 

Action  of  Careiage. — ^Upon  firing  the  piece  the  gun-lever  axle  is 
moved  to  the  rear  by  the  recoiling  energy  of  the  gun,  carrying  the 
top  carriage  with  it.  The  lower  ends  of  the  levers  move  vertically 
upward,  being  constrained  by  the  crosshead  and  bottom  plate  travel- 
ing on  the  vertical  guides.  The  trunnions  of  the  gun  move  downward 
and  to  the  rear  in  the  arc  of  the  ellipse.  The  energy  of  recoil  is 
absorbed  partly  by  raising  the  counterweight  and  partly  by  the 
movement  of  the  masses  up  the  inclined  chassis  rails,  but  principally 
by  the  resistance  of  the  recoil  cy Under;  and  when  the  gun  comes  to 
rest  it  has  the  proper  loading  angle.  After  loading,  the  pawls  are 
released  by  the  tripping  gear,  and  the  excess  of  the  moment  of  the 
counterweight  over  the  moment  of  the  gun,  etc.,  enables  it  to  raise 
the  gun  to  the  firing  position. 

Principal  Parts. — The  carriage  consists  of  the  following  principal 
parts,  namely,  base  ring,  traversing  roller  system,  racer,  dust  guards, 
azimuth  circle  and  pointer,  chassis  and  transoms,  vertical  guides  and 
supporting  brackets,  top  carriage,  recoil  rollers,  counter-recoil  buffers, 
buffer  valve,  gun  levers  and  axle,  crosshead  and  counterweight, 
recoil  system,  retracting  gear,  tripping  gear,  elevating  system  and 
counterbalance  device,  traversing  system,  sighting  platforms,  sight, 
lighting  apparatus,  firing  apparatus,  and  grease  cups.  The  acces- 
sories consist  of  shot  trucks,  shot  tongs,  and  implements. 

Base  Ring. — The  base  ring,  11  feet  in  diameter,  is  made  of  iron 
cast  in  one  piece  and  is  held  in  position  on  the  foundation  by  twelve 
1.75-inch  bolts.  Twelve  screws  for  leveling  the  base  ring  are  set 
against  steel  plates  through  which  the  foundation  bolts  pass. 

The  base  ring,  in  addition  to  having  the  lower  roller  path  on  its 
upper  surface,  has  an  annular  flange  near  its  inner  edge  forming  the 
pintle  for  the  carriage.  This  flange  has  near  its  top  edge  a  Up  inward 
under  which  the  three  clips  engage,  and  on  its  top  edge  the  azimuth 
circle.  The  inner  upper  edge  of  the  lip  is  rabbeted  to  receive  the 
inner  dust  guard.  The  outer  annular  flange  on  the  ring  projects 
upward  outside  of  the  traversing  roUers.  The  cavities  on  each  side 
of  the  roller  path  are  drained  into  the  pit. 

Tapped  holes  can  be  found  inside  of  the  pintle  flange  for  attaching 
the  traversing  stops  in  any  required  position. 

The  base  ring  is  marked  ''front''  in  raised  letters  cast  on  the  outer 
annular  flange. 

Traversing-roller  System. — The  racer  rests,  and  is  traversed, 
upon  a  circle  of  24  live,  conical  traversing  rollers  whose  axes  are 
maintained  in  the  radial  position  by  bearings  bolted  to  the  distance 


ring.  The  rollers  are  of  forged  steel,  solid,  with  a  journal  beyond 
each  end  and  with  flanges  on  their  inner,  small  ends. 

The  distance  ring  is  of  cast  steel,  in  four  sections,  bolted  together. 
The  bearings  for  the  traversing  rollers  are  formed  with  a  loop  on 
top  by  means  of  which  any  roller  with  its  bearings  can  be  lifted  out 
of  the  ring  through  the  two  holes  in  the  top  of  the  racer. 

The  system  is  kept  concentric  with  the  pintle  by  the  flanges  on  the 
rollers  in  centrifugal  contact  with  the  inner  edge  of  the  roller  path 
on  the  base  ring.  The  inner  edge  of  the  path  on  the  racer  is  of  a 
larger  diameter  so  as  not  to  come  in  contact  with  the  flanges. 

Racer. — The  racer  is  made  of  iron  10  feet  3  inches  in  diameter, 
cast  in  one  piece. 

It  is  of  box  section,  and  in  addition  to  having  the  upper  roller 
path  on  its  under  surface,  has  an  annular  flange  lined  with  bronze 
near  its  inner  edge  and  fitting  over  the  pintle,  with  0.04  inch  diam- 
etral clearance. 

Upon  its  top  surface  the  chassis  and  transoms  are  bolted,  doweled, 
and  keyed. 

An  opening  sufficiently  large  for  removing  a  traversing  roller  is 
provided  at  each  side  of  the  racer.  These  holes  are  habitually  kept 
covered  by  steel  plates  provided  for  the  purpose.  Four  oil  holes, 
passing  through  the  racer,  are  provided  for  oiling  the  pintle  surfaces 
and  14  for  oiling  the  traversing-roller  bearings. 

Two  steel  clips  secured  to  the  racer  near  the  front  and  one  in  the 
rear  engage  under  the  lip  inside  the  pintle  of  the  base  ring  to  prevent 
possible  overturning.  The  rear  clip  extends  downward,  forming 
also  the  stop  lug  engaging  the  traversing  stops  and  providing  a 
bearing  for  the  traversing  pinion  shaft. 

Dust  Guards. — The  outer  dust  guard  consists  of  a  steel  angle  in 
four  sections  with  its  horizontal  flange  bolted  to  the  outer  part  of  the 
base  ring.  To  the  vertical  flange  is  clamped  a  projecting  strip  of 
felt  which  bears  against  a  finished  surface  on  the  underside  of  the 
racer. 

The  inner  dust  guard  is  formed  similarly  by  a  strip  of  felt  clamped 
to  the  inner  upper  portion  of  the  base-ring  pintle. 

These  guards  exclude  dust  from  the  traversing  rollers  and  roller 
paths.  The  dust-guard  sections  with  their  felt  strips  are  easily 
removed. 

Azimuth  Circle  and  Pointer. — ^A  brass  azimuth  circle,  attached 
by  countersunk  screws  to  the  top  of  the  pintle  of  the  base  ring,  is 
graduated  in  degrees,  the  numbers  of  which  are  to  be  added  after  the 
carriage  is  erected  in  its  emplacement.  The  top  of  the  racer  is  cut 
away  on  the  right  side  to  expose  the  azimuth  circle  and  the  microm- 
eter pointer  and  the  subscale,  fastened  to  the  racer.  The  subscale 
has  slotted  holes  to  give  it  a  lateral  motion  for  adjustment,  after 
9979—17 2 


10 

which  it  is  fixed  in  position  by  two  screws.  It  is  graduated  and 
stamped  in  decimals  of  a  degree,  the  least  reading  being  0.1  of  a 
degree.  The  micrometer  screw,  actuating  the  pointer,  is  graduated 
to  a  least  reading  of  0.01  of  a  degree.  The  subscale  and  pointer  are 
protected  by  a  hinged  bronze  cover. 

To  adjust  the  azimuth  pointer,  point  the  gun  by  the  bore  sights 
on  a  target,  the  exact  azimuth  of  which  is  known,  set  the  pointer  to 
read  the  hundredths  of  a  degree  in  the  azimuth  reading,  loosen  the 
securing  screws,  move  the  pointer  bodily  until  the  reference  mark  on 
its  moving  part  exactly  coincides  with  a  degree  mark  on  the  azimuth 
circle,  then  secure  in  position.  The  degree  mark  should  be  stamped 
with  the  number  indicating  the  azimuth  bearing  in  degrees  and  the 
remainder  of  the  azimuth  circle  should  be  stamped  with  numbers 
from  this  point  as  a  reference. 

Chassis  and  Transoms. — ^The  chassis  of  cast  iron  are  bolted,  dow- 
eled, and  keyed  to  the  racer  and  are  united  at  their  front  and  rear 
ends  by  cast-steel  transoms,  also  bolted  to  the  racer.  The  rear  tran- 
som carries  the  elevating  slide  and  gearing.  The  upper  surfaces  of 
the  chassis  form  the  recoil-roller  path  and  slope  1  degree  and  20 
minutes  to  the  front  to  facilitate  the  return  of  the  piece  to  the  firing 
position,  thus  reducing  the  necessary  preponderance  of  the  counter- 
weight. 

Four  forged-steel  racks,  in  which  the  gears  on  the  recoil  rollers 
engage,  are  secured  to  the  upper  surfaces  of  the  chassis,  one  on  each 
side  of  each  roller  path.     These  racks  are  not  to  he  removed. 

The  chasis  also  provide  the  necessary  bearings  or  supports  for  all 
the  mechanism  and,  with  the  racer,  supports  for  all  the  minor  attach- 
ments. 

Vertical  Guides. — A  cast-iron  guide  frame  is  bolted  to  the  under- 
side of  each  chassis  opposite  the  counterweight.  The  lower  ends 
are  joined  by  the  piston-rod  beam.  The  inner  faces  of  the  guide 
frames  and  chassis  form  continuous  finished  surfaces,  to  which  are 
bolted  two  vertical  guides  for  the  crosshead  and  bottom  plate,  which 
extend  above  the  chassis  and  are  supported  by  brackets  bolted  to  it. 

Top  Carriage. — ^The  top  carriage  is  of  cast  steel,  in  one  piece.  It 
consists  essentially  of  two  side  pieces,  united  by  a  transom.  Two 
bronze-bushed  bearings  for  the  gun-lever  axle  are  formed  in  the 
upper  part,  to  which  the  axle  caps  are  bolted.  On  the  underside  are 
two  roller  paths.  Four  steel  racks,  in  which  the  gears  on  the  recoil 
roUers  engage,  are  secured  by  screws  to  the  underside  of  the  top  car- 
raige,  one  on  each  side  of  each  roller  path.  Tliese  racks  are  not 
removable. 

Recesses  are  cast  in  each  side  of  the  top  carriage  near  the  front, 
in  which  pinch  bars,  inserted  through  openings  in  the  guide  brackets 


11 

can  be  engaged  to  force  the  top  carriage  forward  against  the  stops,  if 
for  any  reason  it  should  fail  to  return  fully  into  battery. 

Recoil  Rollers  and  Roller  Cages. — The  top  carriage  rests  on  18 
live  recoil  rollers  on  each  side,  held  in  alignment  by  steel  roller  cages. 
They  move  to  the  rear  with  the  top  carriage  at  half  its  speed.  The 
recoil  rollers  are  of  forged  steel  and  each  alternate  one  has  flanges 
which  serve  as  guides.  Each  flanged  roller  is  provided  with  gears 
which  engage  in  the  racks  on  the  top  carriage  and  chassis  and  which 
prevent  skidding  of  the  top  carriage  during  recoil. 

Counter-Recoil  Buffers. — ^A  counter-recoil  buffer  is  fitted  to  the 
forward  end  of  each  chassis  roller  path.  The  buffer  cylinder  is 
securely  bolted  to  the  chassis,  and  on  the  rear  face  of  the  cylinder 
casting  a  stop  is  machined,  against  which  a  corresponding  machined 
surface  on  the  forward  end  of  the  top  carriage  abuts  when  the  gun 
is  fully  in  battery. 

Each  end  of  the  counter-recoil  buffer  cylinders  is  closed  by  a  stuff- 
ing box  fitted  with  hydraulic  packing.  Twenty-four  rings  of  pack- 
ing are  furnished  for  each  carriage,  five  for  each  stuffing  box  and  four 
rings  for  replacements. 

Each  cylinder  is  provided  with  a  fiUing  plug  located  on  the  top, 
in  front  of  the  piston  head  in  its  rear  position.  A  bronze  plate,  with 
instructions  as  to  filling  the  cylinder,  is  secured  by  screws  near  the 
filling  plug.  ' 

Two  holes  extend  through  the  wall  of  the  cylinder  from  the  lowest 
element  of  the  bore,  at  an  angle  of  45°  downward.  To  these  openings 
are  coupled  the  pipes  connecting  with  the  buffer  valve. 

The  openings  are  located  longitudinally,  one  just  in  front  of  the 
rear  stuffing  box,  so  that  it  is  always  in  rear  of  the  piston  head;  the 
other  2.125  inches  in  rear  of  the  front  stuffing  box. 

The  piston  extends  through  both  stuffing  boxes.  The  piston  head, 
located  approximately  in  the  middle  of  the  piston  rod,  is  bronze  lined 
and  has  a  diametral  clearance  in  the  bore  of  0.008  inch,'  which  fact 
necessitates  the  passage  of  oil  from  one  side  of  the  piston  head  to  the 
other  during  rapid  movement,  principally  by  way  of  the  buffer  valve, 
and  very  little  directly  past  the  piston  head. 

On  the  exterior  of  the  buffer  cylinder  at  its  forward  end  are  cast  two 
lateral  horizontal  lugs,  one  on  each  side.  Annular  projections  are 
formed  on  their  rear  faces,  centering  and  supporting  the  buffer-spring 
covers  and  buffer  springs,  which  extend  to  the  rear  alongside  the 
hydraulic  cylinder.  In  the  center  of  these  projections  are  holes 
through  which  the  buffer-spring  rods  pass. 

The  buffer-spring  rods,  of  steel,  are  both  attached  at  their  forward 
ends  to  a  buffer  yoke,  of  cast  steel,  which  is  attached  at  its  middle 
to  the  forward  end  of  the  buffer  piston. 


12 

The  rear  ends  of  the  spring  rods  are  attached  to  buffer-spring  sup- 
ports, which  consist  of  steel  sleeves,  inclosing  the  rods,  with  flanges 
at  their  rear  ends  fitting  easily  in  the  interior  of  the  spring  covers  and 
supporting  the  rear  ends  of  the  springs.  Collars  are  machined  on  the 
buffer-spring  rods,  which,  by  seating  against  the  front  face  of  the 
buffer-cylinder  casting,  limit  the  rearward  movement  of  the  piston  and 
parts  connected  to  it.     A  piston  movement  of  9  inches  is  provided  for. 

The  action  of  each-  counter-recoil  buffer  is  as  follows :  When  the 
gun  is  out  of  battery,  the  buffer  springs,  acting  against  their  fixed  sup- 
ports in  front,  force  the  spring  supports,  spring  rods,  yoke,  and  piston 
rod  to  the  rear  until  stopped  by  the  collars  on  the  spring  rods.  The 
buffer  piston  head  in  this  position  is  0.75  inch  in  front  of  the  rear 
stuffing  box.  The  rear  end  of  the  piston  rod  projects  9  inches  in  rear 
of  the  stop  of  the  top  carriage  when  in  battery. 

When  the  gun  rises  into  battery  the  top  carriage  strikes  the  pro- 
jecting end  of  each  piston  rod  and  forces  it  to  the  front,  compressing 
the  buffer  springs. 

For  the  first  7.5  inches  of  piston  movement  the  oil  in  front  of  pis- 
ton, being  displaced,  passes  through  the  forward  opening  in  the  bot- 
tom of  the  bore  to  the  buffer  valve  and  returns  to  the  cylinder  through 
the  rear  opening.  The  forward  opening  is  at  this  point  closed  by 
the  piston  head  and  for  the  remaining  1.5  inches  of  piston  movement 
the  cylinder  acts  as  a  dashpot,  it  being  possible  for  oil  to  escape  only 
around  the  piston  head.  Unless  the  energy  of  the  top  carriage,  etc., 
is  too  great  at  the  end  of  7.5  inches  of  movement,  due  to  the  buffer 
valve  not  being  correctly  set,  they  will  be  brought  to  rest  against  the 
stops  without  jar  to  the  carriage. 

If  for  any  reason  the  retracting  clutches  should  fail  to  retain  the 
gun  out  of  battery  after  recoil,  it  is  necessary,  to  prevent  jar  to  the 
carriage,  that  the  buffer  pistons  reach  their  rearward  position  before 
the  top  carriage  strikes  them,  in  order  that  they  may  do  the  full 
amount  of  work  of  retardation.  The  buffer  springs  have  been  de- 
signed to  accomplish  this,  assuming  that  the  stuffing  boxes  do  not  offer 
an  unreasonable  frictional  resistance.  It  is  therefore  important  to 
screw  up  the  glands  only  sufficiently  to  prevent  lealcage.  From  the 
foregoing  description  it  is  evident  that  it  will  be  necessary  to  tighten 
the  front  stuffing  box  more  than  the  rear  one. 

Buffer  Valve. — Both  counter-recoil  buffers  are  joined  to  the 
bilffer  valve,  the  different  settings  of  which  enable  the  energy  of 
counter  recoil  to  be  absorbed  without  shock  to  the  carriage  under 
varying  conditions  affecting  the  velocity  of  counter  recoil.  Aside 
from  mechamical  difficulties  and  those  due  to  differences  in  the  ele- 
ments of  loading,  the  following  sources  of  variation  may  be  mentioned: 
Atmospheric  temperature,  affecting  the  oil  in  both  recoil  and  buffer 


13 

cylinders;  specific  gravit}^  of  this  oil  (prescribed  0.85),  and  the  load- 
ing position. 

The  equalizing  and  throtthng  pipes  serve  to  connect  the  buffer 
valve  to  the  buffer  cylinders,  to  equalize  the  pressure  in  the  buffer 
cylinders,  and  to  facilitate  filling  them.  Four  plugs  are  furnished  to 
close  the  buffer  cylinders  in  case  these  pipes  are  damaged  in  action. 

The  buffer  valve  is  located  at  the  top  of  the  oval  opening  in  the 
front  transom,  to  which  it  is  attached  by  two  bolts.  It  is  accessible 
^rom  the  front  of  the  carriage. 

It  consists  essentially  of  a  valve  body,  gland,  disk,  and  handle  of 
bronze,  and  a  stem  of  steel  and  bronze. 

The  body  which  supports  the  other  parts  and  provides  means  for 
attachment  to  the  front  transom  has  two  T-shaped  chambers.  The 
horizontal  branches  are  coupled  to  the  equalizing  and  throttling  pipes, 
the  upper  leading  to  the  forward  ends  of  the  buffer  cylinders  and  the 
low^er  to  the  rear  ends.  The  vertical  branches  overlap,  that  of  the 
upper  chamber  being  in  front  of  that  of  the  lower  chamber.  A  hori- 
zontal hole  extends  from  the  front  of  the  body  through  the  vertical 
branch  of  the  upper  chamber  and  through  the  wall  between  the  two 
branches  to  the  rear  chamber.  In  the  hole  through  the  wall  between 
the  chambers  is  screwed  a  steel  valve  seat  which  has  a  central  hole 
enlarging  in  the  front  face  into  a  conical  seat  for  the  point  of  the 
valve  stem.  The  larger  part  of  the  oil  displaced  in  the  counter-recoil 
buffers  during  counter  recoil  passes  through  this  hole. 

Just  in  front  of  the  front  and  upper  chamber,  the  hole  is  threaded 
to  receive  a  corresponding  threaded  portion  on  the  valve  stem.  So 
that  if  the  stem  be  turned  clockwise,  its  conical  point  wiU  bear  on 
the  valve  seat  and  close  the  valve;  if  the  stem  be  turned  counter- 
clockw^ise,  the  opening  about  its  point  will  increase  and  may  reach  a 
maximum  of  about  0.056  square  inch. 

The  disk  is  fixed  to  the  body  concentric  with  the  stem.  On  the 
front  face  is  an  annular  flange  with  82  internal  teeth,  in  which  3  corre- 
sponding teeth  on  the  handle  engage  in  order  to  retain  the  valve  at  any 
desired  setting.  The  teeth  on  the  disk  are  numbered  counterclock- 
wise from  0  to  80  at  intervals  of  5  teeth.  A  pin  set  in  the  face  of  the 
disk  prevents  the  handle  being  turned  more  than  360  degrees. 

The  handle  is  a  bar  with  a  rectangular  hole  in  the  middle  which 
fits  on  a  corresponding  portion  of  the  stem.  At  one  end  is  a  pointer 
with  teeth  which  engage  in  the  teeth  of  the  disk.  An  index  line  on 
the  handle  permits  accurate  setting  at  any  desired  tooth.  The  rec- 
tangular portion  on  the  stem  is  so  laid  out  that  the  handle  engages 
at  0  of  the  disk  w^hen  the  valve  is  closed.  The  handle  can  be  moved 
along  the  stem  to  permit  disengaging  the  teeth  when  changing  the 
setting.  A  padlock  is  provided  in  order  that  the  valve  setting  may 
not  be  tampered  with  by  unauthorized  persons. 


14 

When  the  carriage  has  been  erected  at  the  fortification  and  a  thor- 
ough knowledge  obtained  of  its  characteristics  in  counter  recoil,  under 
all  conditions,  the  disk  should  be  stamped,  under  the  direction  of  the 
Ordnance  Department,  at  the  proper  points  of  the  annular  space 
provided  for  this  purpose,  with  the  words  "Very  hot,"  '^Hot," 
'^ Warm,"  "Medium,"  "Cool,"  "Cold,"  and  "Very  cold,"  to  facilitate 
setting  the  buffer  valve. 

A  stuffing  box  is  formed  in  the  body  around  the  stem,  in  which 
four  rings  of  packing  are  placed. 

An  emptying  plug  is  located  at  the  bottom  of  the  valve  body  which 
serves  to  drain  the  buffer  cyhnders. 

The  setting  of  the  buffer  valve  is  best  determined  by  trial.  The 
setting  of  the  recoil  valve  should  be  considered  in  setting  the  buffer 
valve.  With  a  higher  setting  of  the  recoil  valve,  counter  recoil  will 
be  more  free,  and  consequently  the  buffer-valve  setting  should  be 
lower.  The  following  data  are  given  as  a  rough  guide  in  setting  the 
buffer  valve  before  more  definite  knowledge  has  been  gained  by  trial: 

Atmospheric  temperature,  °F.  Buffer-valve  setting. 
0  to  30  80  to  45 

30  to  60  45  to  20 

60  to  80  20  to  15 

The  counter  recoil  should  he  regulated  hy  settings  of  the  counter-recoil 
buffer  valve  and  not  hy  adding  or  removing  counterweight. 

Gun  Levers  and  Axle. — The  gun  levers  support  the  gun  at  its 
trunnions  in  bronze-bushed  bearings  at  their  upper  or  rear  ends; 
and  the  crosshead,  counterweight,  bottom  plate,  and  recoil  cyUnder 
in  bushed  bearings  at  their  lower  or  forward  ends.  The  arms  of  the 
axle  pass  through  the  bores  in  the  gun  lever,  project  beyond  them, 
and  rest  in  the  bearings  of  the  top  carriage. 

Crosshead  and  Counterweight. — ^The  crosshead  is  a  steel  casting 
which  serves  to  attach  the  counterweight  to  the  gun  levers,  and 
through  the  guide  chps  bolted  to  both  sides  of  it,  together  with 
similar  clips  cast  on  the  bottom  plate,  constrains  the  counterweight 
to  move  vertically,  preserving  the  aUgnment  of  the  recoil  cylinder. 

The  gun-lever  pins  of  forged  steel  are  inserted  from  the  inside  of 
the  crosshead  through  the  bearings  in  the  gun  lever.  A  key  covers  a 
segment  of  the  inner  end  of  each,  and  is  secured  at  both  ends  to  the 
face  of  the  bearing  in  the  crosshead,  serving  to  prevent  the  gun-lever 
pin  from  working  out  of  place.  A  tongue  on  this  key  rests  in  a 
groove  in  the  gun-lever  pin  and  prevents  rotation.  Each  pin  is 
tapped  axially  at  its  inner  end  to  receive  the  extractor  used  to  with- 
draw it. 

The  guide  chps  are  keyed  longitudinally  to  the  crosshead,  and  are 
secured  by  bolts  pinned  and  permanently  finished  in  place. 


15 

On  the  front  face  of  each  guide  cUp  is  machined  a  rack  in  which 
pawls  pivoted  to  the  chassis  rails  engage,  thus  preventing  the  gun 
from  returnmg  to  the  firing  position  after  recoiling  or  being  retracted. 

There  is  a  finished  hole  in  the  center  of  the  crosshead  in  which  the 
upper  end  of  the  recoil  cylinder  fits  closely  for  alignment. 

In  each  comer  of  the  crosshead  are  bored  vertical  holes  through 
which  the  four  suspension  rods  depend.  These  rods  are  secured  to 
the  crosshead  by  castellated  nuts  with  split  pins  which  draw  the 
shoulders  on  the  rods  firmly  against  the  finished  under  surface  of 
the  crosshead.  In  a  similar  manner  there  is  attached  to  the  lower 
ends  of  the  rods  the  bottom  plate,  on  which  rests  the  counterweight 
and  to  which  is  attached  the  recoil  cylinder. 

Guide  clips  are  cast  on  the  bottom  plate  which  correspond  to  those 
attached  to  the  crosshead. 

On  the  bottom  plate  is  piled  the  counterweight,  consisting,  when 
mounting  6-inch  gun,  model  of  1905,  of  eleven  cast-iron  weights; 
six  are  about  4,000  pounds  each,  forming  the  first  six  layers.  The 
seventh  layer  consists  of  three  weights,  a  total  of  about  2,000  pounds, 
the  inner  placed  under  the  crosshead  with  an  outline  and  upper  sur- 
face corresponding  to  the  rods  on  the  crosshead,  and  two  outer 
ones  held  in  place  by  T  slots,  which  engage  over  similar  projections 
cast  on  the  front  and  rear  sides  of  the  crosshead.  The  eighth  layer 
of  about  1,500  pounds  consists  of  two  weights  in  front  and  rear  of 
the  crosshead  of  the  same  shape  as  the  outer  weights  of  the  seventh 
layer  and  held  in  place  by  projections  on  the  bottom,  which  seat  in 
depressions  on  the  upper  surface  of  the  weights  below. 

The  eighth  layer  and  the  outer  weights  of  the  seventh  layer  can  be 
removed  without  disturbing  the  crosshead;  the  others  can  not. 

It  is  not  intended  that  counterweigJit  should  he  removed  or  added  to 
regulate  counter  recoil,  and  none  is  provided  for  this  purpose. 

The  total  weight  attached  to  the  gun  levers,  including  crosshead, 
counterweight,  bottom  plate,  and  recoil  cylinder  filled  with  oil,  is 
about  35,000  pounds.  The  counterweight  alone  is  approximately 
27,000  pounds.  The  preponderance  of  the  weight  of  the  counter- 
weight, etc.,  over  the  weight  of  the  gun  is  approximately  14,000 
pounds. 

When  6-inch  gun,  model  of  1908  (wire  wrapped),  is  mounted,  only 
four  weights  are  used,  viz.,  the  first  three  layers,  and  a  special  layer, 
the  latter  having  the  snme  outline  but  less  depth.  The  fourth  layer 
weighs  about  2,800  pounds. 

The  total  weight  attached  to  the  gun  levers,  including  crosshead, 
counterweight  bottom  plate,  and  recoil  cylinders  filled  with  oil,  is 
about  22,600  pounds.  The  counterweight  alone  is  approximately 
14,600  pounds.  The  preponderance  of  weight  of  the  counterweight, 
etc.,  over  the  weight  of  the  gun  is  approximately  10,000  pounds. 


16 

Recoil  System  (Plate  V). — The  energy  of  recoil  is  absorbed  prin- 
cipally by  a  single  vertical  hydraulic  cylinder  moving  with  the  coun- 
terweight and  a  piston  and  rod  secured  at  its  lower  end  to  the  middle 
of  the  piston-rod  beam. 

Recoil  is  varied  to  meet  varying  conditions  of  atmospheric  tem- 
perature, velocity  of  projectile,  etc.,  by  means  of  a  recoil  valve  con- 
tained in  the  piston  rod. 

The  principal  parts  of  the  recoil  system  are:  The  recoil  cylinder, 
the  upper  and  lower  cylinder  heads  with  stuffing  boxes,  drain  plug, 
filling  plug,  piston  and  rod,  valve  stem  and  body,  locking  disk,  hasp 
and  hasp  bracket,  piston-rod  bracket,  and  recoil  indicators. 

The  recoil  cylinder  has  two  throttling  bars  bolted  to  its  inner 
surface  at  opposite  ends  of  a  diameter.  The  bars  are  of  variable  cross 
section  in  order  to  oppose  a  constant  resistance  to  the  energy  of 
recoil  of  the  carriage.  The  piston  is  slotted  to  receive  the  throttling 
bars;  the  area  of  the  orifice  will  vary  with  the  position  of  the  piston. 
The  two  ends  of  the  cylinder  are  closed  by  the  upper  and  lower  cylin- 
der heads. 

Narrow  copper  gaskets  ^  inch  thick,  seated  in  recesses  at  both 
ends  of  the  cylinder,  are  compressed  in  securing  the  cylinder  heads 
sealing  the  joints  against  oil  pressure. 

Around  the  bore  of  each  cylinder  head  a  stuffing  box  prevents  the 
escape  of  oil  by  the  piston  rod.  Each  stuffing  box  requires  6  rings 
of  hydraulic  packing  0.5  by  0.5  inch  square.  Eighteen  rings  are 
issued  with  each  carriage,  6  being  for  reserve. 

In  the  lower  cylinder  head  is  a  recess  5.25  inches  in  diameter.  On 
the  piston  below  the  head  is  a  corresponding  enlargement  which  enters 
this  recess  with  slight  clearance.  If  at  the  end  of  recoil  the  energ}^ 
has  not  been  normally  absorbed,  these  parts,  acting  as  a  dash  pot, 
provide  a  safeguard  against  possible  injury  to  the  carriage. 

The  filling  and  drain  holes  are  in  the  upper  and  lower  cylinder 
heads,  respectively.  The  filling  plug  is  in  the  form  of  a  tap  bolt; 
one  additional  is  supplied.  The  drain  plug  is  so  arranged  that  the  oil 
can  be  withdrawn  from  the  cylinder  without  unscrewing  the  plug 
more  than  a  few  turns.  A  brass  gutter  is  bolted  to  the  piston-rod 
beam  under  the  plug  for  the  purpose  of  conducting  the  oil  within 
reach  of  the  receptacle. 

The  piston  and  rod  are  of  forged  steel  in  two  pieces,  the  lower 
part  of  the  rod  being  formed  in  one  piece  with  the  piston.  ITie  lower 
end  passes  through  a  hole  in  the  piston-rod  beam.  Two  nuts  engage 
on  threaded  portions  of  the  rod  above  and  below  the  beam,  cylin- 
drical portions  on  them  seating  in  counterbores  in  the  beam,  thus 
aligning  the  rod.  The  upper  nut  is  secured  by  a  taper  pin;  the  lower 
is  castellated  and  secured  by  a  split  pin. 


17 

The  upper  end  of  the  rod  is  bored  axially  to  receive  the  stem  and 
body  of  the  recoil  valve.  At  the  piston  two  grooves  surround  the 
bore.  Four  holes  radiate  from  each  of  these  grooves,  one  set  open- 
ing on  each  side  of  the  piston.  Oil  can  therefore  pass  from  one  side 
of  the  piston  to  the  other  in  three  ways,  namely,  by  the  outside  of 
the  piston  head,  through  the  diametral  clearance  of  0.02  inch,  through 
the  orifices  between  the  throttling  bars  and  the  slots  in  the  piston, 
and  through  the  two  sets  of  radial  holes. 

Passage  through  the  radial  holes  is  restricted  by  the  recoil  valve 
body.  This  is  a  bronze  bar  fitting  closely  in  the  piston-rod  bore 
opposite  the  piston.  It  has  a  diametral  slot  0.4  inch  wide,  1.625 
inches  long,  and  1.375  inches  from  the  lower  end.  With  the  recoil 
valve  open  this  slot  reaches  from  one  groove  to  the  other.  As  the 
valve  body  is  withdrawn  upward  the  portion  of  the  slot  open  to  the 
lower  groove  decreases  to  zero,  when  the  passage  between  the  two  sets 
of  radial  holes  is  closed. 

At  the  upper  end  of  the  piston  a  bronze  valve-stem  nut  is  screwed 
into  the  bore  and  secured  by  a  nut-locking  screw.  A  slot  in  the  upper 
end  of  this  nut  affords  means  of  removing  and  inserting  it  with  the 
tit  wrench  provided  for  this  purpose. 

The  valve  stem  is  a  steel  rod  connecting  the  valve  body  with  the 
valve-stem  nut  for  the  purpose  of  actuating  the  former.  The  upper 
end  of  the  valve  stem  has  a  flatted  portion,  over  which  the  locking 
disk  is  seated  and  on  which  the  wrench  for  the  recoil  valve  engages. 
This  wrench  is  provided  on  one  end  of  the  tit  wrench  for  the  valve- 
stem  nut.  In  order  to  remove  the  valve,  the  valve-stem  nut  must  be 
taken  out. 

The  locking  disk  is  of  steel,  3.5  inches  in  diameter,  and  has  11 
notches  on  its  circumference  to  indicate  the  open,  closed,  and  nine 
intermediate  positions  of  the  recoil  valve.  The  notch  corresponding 
to  the  closed  position  of  the  valve  is  stamped  ^^ Closed."  The  remain- 
ing 10  notches  are  equally  spaced  and  numbered  counterclockwise 
from  1  to  10. 

When  the  shoulder  on  the  valve  stem  stops  against  the  lower  end 
of  the  valve-stem  nut,  the  '' closed"  notch  is  toward  the  front  of  the 
carriage  and  opposite  the  hasp  and  the  bottom  of  the  slot  in  the  valve- 
stem  body  is  0.25  inch  above  the  lower  groove  in  the  piston-rod  bore. 
When  the  disk  is  turned  clockwise  90°,  the  valve  stem  descends  0.25 
inch  and  brings  the  bottom  of  the  slot  to  coincidence  with  the  upper 
edge  of  the  lower  groove.  A  further  movement  of  18°  uncovers  the 
lower  groove  0.05  inch,  or  an  area  of  0.02  square  inch,  and  brings  the 
first  notch  of  the  locking  disk  opposite  the  hasp.  Similarly  each 
additional  notch  opens  the  passage  through  the  piston  0.05  inch. 
When  the  tenth  notch  is  opposite  the  hasp,  the  lower  groove  is  un- 
covered 0.5  inch,  and  the  valve  is  open. 
9979—17 3 


18 

The  upper  end  of  the  piston  rod  is  flatted  to  retain  it  in  a  fixed 
position  with  respect  to  rotation.  A  piston-rod  bracket  of  cast  steel 
maintains  the  upper  end  of  the  piston  rod  in  alignment.  The  hasp 
bracket  is  bolted  to  the  piston-rod  bracket  in  front  of  the  piston  rod, 
seating  against  the  flatted  portion  on  the  latter.  The  hasp,  by  engag- 
ing in  notches  on  the  locking  disk,  retains  the  recoil  valve  at  any 
desired  setting.  A  flange  on  the  top  of  it  prevents  the  locking  disk 
from  moving  vertically  when  the  hasp  is  engaged.  A  slot  in  the  hasp 
passes  over  a  lug  on  the  hasp  bracket,  after  which  a  padlock  is  secured 
to  the  lug,  preventing  any  unauthorized  change  in  the  setting  of  the 
recoil  valve. 

A  filling-plug  instruction  plate  is  secured  to  the  crosshead  near  the 
filling  plug,  so  as  to  be  visible  from  the  front  of  the  carriage. 

The  normal  recoil  is  47.8  inches;  4.2  inches  additional  recoil  is 
provided  for.  During  this  additional  recoil,  the  recoil  buffer  pre- 
viously described  would  act  to  bring  the  carriage  to  rest  without 
shock. 

A  bronze  scale  32  inches  long  is  secured  to  an  angle  iron  on  each 
side  of  the  crosshead  joining  the  guide  clip  with  the  bottom  plate. 
Numbered  graduations  are  cast  upon  it  at  intervals  of  1  inch,  from 
25  to  52,  inclusive.  A  pointer  to  indicate  the  recoil  is  secured  to  the 
inside  of  each  chassis.  The  pointers  and  scales  are  visible  through 
round  openings  in  each  side  of  the  chassis. 

The  recoil  valve  is  the  only  means  provided  for  varying  the  length 
of  recoil,  arid  no  attempt  should  be  made  to  use  other  means  for  this 
purpose.  Although  the  setting  of  the  recoil  valve  slightly  affects  counter- 
recoil,  it  should  not  he  used  to  regulate  the  latter  movement. 

When  more  definite  data  are  not  available,  the  valve  setting  for 
the  first  round  at  full  charge  should  be: 

Atmospheric  Recoil-valve 

temperature.  setting. 

Below  30°  F 9 

30°  to  70°  F 8 

Above  70°  F 7 

A  careful  record  should  be  kept  of  recoil-valve  settings  for  each  car- 
riage in  a  form  convenient  for  their  study  for  guidance  in  future 
firings. 

For  firings  with  all  charges,  the  recoil  cylinder  should  he  filled  to  the 
level  of  the  filling  hole  with  the  oil  issued  for  this  purpose,  and  frequent 
inspections  should  he  made  of  the  lower  stuffing  box  during  firing  to  guard 
against  lealcage  of  oil.  If  escape  of  oil  occurs,  the  cylinder  should  be 
refilled  and  the  cause  of  leakage  remedied. 

Retracting  System. — The  retracting  system  enables  the  gun  to 
be  retracted  from  the  firing  to  the  loading  position  when  desired. 
The  effort  required  is  least  at  the  start  and  steadily  increases. 


19 

Retraction  is  by  hand  power  only,  power  being  applied  to  cranks 
on  each  side  of  the  carriage.  The  extremities  of  the  shaft  on  which 
the  cranks  engage  are  flat  on  three  sides,  and  the  cranks  are  secured 
by  two  split-pin  fastenings,  making  them  easily  removable. 

The  retracting  cranks  should  he  removed  and  placed  on  the  chassis 
hooks  provided  for  them  when  they  are  not  actually  in  use. 

The  retracting  crank  shaft  actuates,  through  a  train  of  two  pairs 
of  spur  gearing,  two  drums,  to  which  are  fastened  by  corrugated 
clamps  two  wire  ropes,  which  wind  upon  the  drums.  A  ratchet  and 
pawl  on  the  right  end  of  the  retracting  crank  shaft  prevents  the  load 
from  overhauling  the  gearing.  From  the  drums  these  ropes  pass 
around  guide  pulleys  in  the  rear  ends  of  the  chassis,  and  are  hooked 
to  the  upper  end  of  the  gun  levers.  These  ropes  remain  with  the 
carriage,  and  when  not  in  use  are  wound  upon  the  drums  mitil  the 
ropes  project  but  a  short  distance  beyond  the  guide-pulley  brackets. 

In  hauling  down,  care  should  be  taken  to  see  that  the  ropes  are 
under  equal  tension.  After  taking  up  the  slack  in  the  ropes,  and 
putting  some  strain  on  them,  they  should  be  vibrated  slightly,  and 
if  found  to  be  unequally  loaded  adjustment  should  be  made  at  the 
rope  clamps  on  the  driuns.  After  the  loop  of  the  rope  is  passed  over 
the  hook  on  the  upper  end  of  the  gun  lever,  and  while  winding  up  the 
slack,  especial  care  should  be  taken  that  the  rope  is  guided  to  the 
pulleys  without  any  kinks  or  any  slack  and  that  the  coils  lie  smoothly 
upon  the  driuns  without  crossing  the  ridges  between  the  grooves. 

The  wire  ropes  should  always  be  detached  from  the  gun-lever  hooks 
before  tripping. 

Bearings  of  the  shafts  of  the  retracting  gearing  are  provided  with 
roller  bearings.  Longitudinal  motion  is  in  general  prevented  by 
thrust  collars  pinned  to  the  shaft  and  having  grooves  fitted  with  felt 
to  protect  the  bearings  from  dust.  Ample  means  of  lubrication  are 
provided,  and  it  is  important  that  parts  of  the  retracting  gearing  be  kept 
well  lubricated. 

Retracting  Clutch  and  Brake. — To  permit  the  most  rapid 
overhauling  of  the  wire  ropes  possible  there  is  provided  a  spring 
engaging  claw  clutch  for  rotating  the  drum  shaft  from  the  drum 
shaft  gear  in  retracting.  With  the  clutch  disengaged  the  ropes  can 
be  drawn  out  quickly,  revolving  the  drums  and  drum  shaft  rapidly 
in  the  drum -shaft  gear.  The  clutch  is  disengaged  by  pushing  in  the 
loop  handle  on  the  left  and  giving  it  a  quarter  turn,  which  locks 
the  clutch  out  with  the  spring  compressed. 

In  order  to  prevent  overrunning  and  injury  to  the  ropes  a  band 
brake  is  added,  gripping  a  brake  wheel  keyed  to  the  drum  shaft 
upon  lifting  a  brake  lever.  This  is  on  the  left  of  the  carriage.  When 
enough  rope  has  been  overhauled  the  brake  handle  is  raised  to  stop 
the  shaft,  the  loop  handle  is  given  a  quarter  turn  back  to  permit  the 


20 

clutch  to  engage,  and  the  sprmg  moves  the  clutch  on  its  feathers  in 
the  drum  shaft  to  engagement. 

Tripping  Gear. — The  tripping  gear  is  for  the  purpose  of  releas- 
ing the  pawls  from  the  racks  on  the  guide  clips,  permitting  the  gun 
to  return  to  the  firing  position;  of  automatically  holding  the  pawls 
released  until  the  counterweight  has  descended  sufficiently  for  the 
top  of  the  racks  on  the  guide  clips  to  be  below  the  pawls;  and  of 
automatically  releasing  the  pawls,  permitting  them  to  reengage  when 
the  gun  recoils  or  is  retracted. 

The  tripping  gear  consists  of  the  following  principal  parts:  Trip- 
ping lever  and  shaft;  tripping  crank  and  link;  locking  lever  and 
link;  tripphig-lever  latch;  safety  latch;  safety-latch  dog  (on  front 
face  of  left  guide  clip,  to  right  of  rack);  and  pawls. 

The  tripping  lever  is  located  outside  of  the  front  end  of  the  left 
chassis,  and  is  keyed  on  the  end  of  the  tripping-lever  shaft.  This 
shaft  extends  across  the  front  of  the  carriage  and  rests  in  bronze 
bushed  bearings  in  each  chassis.  Vertical  rotation  upward  of  the 
tripping  lever  is  limited  by  the  safety  latch.  Downward  rotation 
of  the  tripping  lever  is  limited  by  a  stop  bolted  to  the  racer. 

To  prevent  injury  to  the  carriage  from  tripping  the  gun  when  the 
buffer  pistons  have  not  been  returned  to  the  rear  by  the  buffer  springs, 
a  tripping-lever  latch  is  provided,  which  is  connected  through  the 
locking  lever  and  link  to  the  buffer  yoke.  The  latch  engages  the  trip- 
ping crank  and  prevents  lifting  the  tripping  lever  till  the  buffer  yoke 
has  completed  7  inches  of  the  9-inch  movement  to  the  rear,  when 
the  latch  is  disengaged  and  the  gun  may  be  tripped.  To  trip  the 
gun  the  lever  is  moved  upward  as  far  as  it  will  go,  which  will  bring 
it  about  horizontal.  This  disengages  the  pawls  from  the  racks,  and 
the  safety  latch,  catching  the  end  of  the  pawl  lever,  holds  the  pawls 
away  from  the  racks  during  the  descent  of  the  counterweight  till 
released  by  the  dog  on  the  left  guide  clip.  The  safety  latch  is  not 
released  till  the  tops  of  the  racks  are  below  the  pawls.  When  the 
dog  releases  the  safety  latch,  the  tripping  lever  is  returned  by  its 
own  movement  to  its  normal  position  against  the  stop.  The  pawls 
are  then  ready  to  engage  the  racks  when  they  again  rise. 

The  Elevating  System  (Plate  VII). — The  gun  is  moved  in  ele- 
vation by  turning  an  elevating  handwheel,  located  on  the  left  side 
of  carriage,  which  is  connected  through  its  shaft  and  bevel  gears  to 
a  screw  fixed  to  the  rear  transom.  A  moving  nut  on  the  screw  is 
connected  with  the  lower  end  of  the  elevating  arm,  whose  upper 
end  is  attached  to  the  gun  66  inches  in  rear  of  the  trunnion. 

The  elevating  system  consists  of  the  elevating  band  and  arms, 
slide,  slide  nut,  slide  spring,  screw,  shaft  gear,  shaft  and  handwheel; 
also  pinions,  intermediate  gear,  intermediate  pinions,  elevation  disk 


21 

gear,  elevation  disk  pointer,  spiral  spring,  and  the  counterbalance 
device. 

The  elevating  band  seats  in  a  groove  in  the  gun.  On  the  extremi- 
ties of  a  horizontal  diameter  are  band  trunnions  which  are  inserted 
after  the  elevating  arm  is  in  position. 

The  elevating  arm  is  connected  at  its  lower  end  to  the  elevating 
slide  by  means  of  the  elevating  pin,  which  is  inserted  through  bronze 
bushed  bearings  in  the  shde  and  through  a  hole  in  the  elevating  rod; 
at  its  upper  end  it  is  connected  to  the  elevating  band. 

The  elevating  slide  consists  of  two  side  pieces  connected  by  tran- 
soms. Along  the  lower  edges  are  bronze-Hned  flanges.  In  the  rear 
transom  are  planed  guideways  for  these  flanges.  The  slide  is  held 
in  place  by  two  cast-steel  gibs  bolted  to  the  rear  transom.  To  the 
side  of  the  right  guideway  is  bolted  the  elevating  stop. 

Due  to  the  severe  downward  shock  received  through  the  elevating 
arm  when  the  gun  is  fired,  the  thrust  is  transmitted  from  the  elevat- 
ing slide  to  the  slide  nut  by  a  helical  spring  surrounding  the  shde 
nut.  It  is  compressed  between  the  flange  on  the  lower  end  of  the  nut 
and  the  upper  transom  of  the  elevating  slide.  In  order  that  the  ele- 
vating shde  and  slide  nut  shall  have  the  same  relative  position  at  all 
times,  except  when  the  spring  is  compressed  by  firing,  a  spring-con- 
pressing  nut  is  screwed  into  the  lower  transom  of  the  slide,  with  its 
upper  end  bearing  on  the  bottom  of  the  slide  nut.  The  spring-com- 
pressing nut  is  set  up  so  as  to  give  the  spring  an  initial  compression, 
which  will  positively  return  the  compressing  nut  to  a  bearing  against 
the  slide  nut  after  the  spring  is  compressed  by  firing.  This  initial 
compression  is  given  during  the  shop  test  of  the  carriage,  and  a 
taper  pin  is  inserted  in  the  elevating  shde  through  a  hole  in  the  flange 
on  the  head  of  the  compressing  nut.  In  case  the  nut  should  later  he 
removed,  care  must  he  exercised  that  it  he  returned  to  exactly  its  orig- 
inal position,  as  the  0  of  the  elevation  scale  will  otherwise  he  thrown 
out  of  adjustment. 

The  elevating  shaft  is  located  at  the  rear  and  left  side  of  the  car- 
riage. It  rests  in  three  roller  bearings,  one  in  the  left  chassis  and  two 
in  lugs  cast  on  the  middle  of  the  top  of  the  rear  transom.  To  the 
outer  extremity  is  keyed  the  elevating  handwheel  shaft  of  wrought 
iron  with  cast-iron  hub.  Between  the  two  inner  bearings  of  the  shaft 
is  keyed  a  forged  steel  elevating  shaft  bevel  pinion  engaging  in  the 
gear  on  the  elevating  screw. 

The  elevation  disk  and  pointer  are  for  the  purpose  of  indicating 
the  elevation  of  the  gun,  both  in  degrees  and  yards  of  range,  for  a 
given  weight  of  projectile  and  muzzle  velocity.  It  consists  princi- 
pally of  a  German  silver  disk,  range  and  elevation  scales,  pointer 
base,  pointer,  and  spring. 


22 

The  elevation  disk  of  German  silver  is  graduated  in  yards  of 
range,  service  velocity,  on  its  outer  circumference;  on  its  inner  cir- 
cumference appear  graudations  for  yards  of  range  with  subcaUber 
ammunition;  the  elevation  scale  is  graduated  at  5°  intervals,  the 
graduations  being  between  the  two  range  scales.  The  interval  of 
graduations  for  range  scales  is  20  yards;  range  scales  to  be  gradu- 
ated after  piece  is  mounted  in  emplacement,  from  data  furnished  by 
the  Ordnance  Department;  elevation  scale  to  be  graduated  in  shop 
by  use  of  cHnometer. 

The  elevation  disk  is  secured  to  the  face  of  the  elevation  disk  gear 
by  24  German  silver  screws,  and  is  rotated  by  means  of  the  train  of 
gears  upon  changing  the  elevation  of  the  gun.  A  spiral  spring, 
assembled  under  tension,  takes  up  all  back-lash  in  the  gears. 

The  pointer  base  is  bolted  to  the  left  chassis,  and  serves  as  a  sup- 
port for  the  pointer.  The  latter  is  of  bronze,  with  an  approximately 
rectangular  opening  for  viewing  the  scales.  Three  German  silver 
strips  for  zero  marks  are  dovetailed  and  pinned  in  place.  A  correc- 
tion screw  with  knurled  head,  turning  in  a  seat  in  the  pointer  base, 
engages  teeth  on  the  outer  circumference  of  the  pointer,  thus  pro- 
viding a  means  of  correcting  the  scale  by  shifting  the  index. 

The  counterbalance  device  tends  to  equalize  the  force  required  for 
elevating  and  depressing,  with  the  gun  in  the  loading  as  well  as  in  the 
firing  position.  A  cast-iron  cylindrical  weight  of  580  pounds  is  sus- 
pended by  means  of  an  equalizing  bar  fork  extending  through  it  axi- 
ally  from  the  equahzing  bar.  To  the  extremities  of  the  latter  are 
attached  the  ends  of  the  rope.  Its  bight  passes  over  two  pairs  of 
guide  sheaves  to  the  upper  end  of  the  guideways  of  the  rear  transom, 
thence  to  the  lower  end  of  the  elevating  slide  nut,  to  which  it  is 
secured  by  two  clamps  bolted  to  the  slide  nut. 

The  weight  descends  vertically  into  the  counterweight  well  as  the 
gun  is  depressed. 

All  gears  of  the  elevating  system  are  provided  with  cast-iron  gear 
covers  in  halves  bolted  together.  Oil  plugs  in  them  provide  easy 
means  of  oiling  the  gears.  Roller  and  other  bearings  are  also  pro- 
vided with  ample  means  of  lubrication. 

Traversing  System. — The  traversing  system  enables  the  racer 
and  parts  supported  by  it  to  be  easily  and  quickly  moved  in  azimuth 
on  the  traversing  rollers,  either  from  the  working  platform  or  from 
the  sighting  platform. 

Traversing  is  accomplished  by  rotation  of  the  traversing  pinion, 
which  is  attached  to  a  vertical  shaft  at  the  rear  of  the  carriage  and 
engages  in  a  steel  rack  fixed  to  the  interior  of  the  base  ring. 

The  traversing  system  consists  principally  of  gearing  for  rapid 
movement  from  the  working  platform  at  the  right  side  of  the  car- 
riage and  of  slow-motion  gearing  for  smooth  slow  movement,  as  in 


23 

following  a  target.  It  is  composed  of  traversing  rack,  pinion,  pinion 
shaft,  crank  shaft,  and  gears. 

The  traversing  rack  is  of  six  sections  joined  in  such  a  manner  that 
they  can  be  easily  removed  individually  and  secured  to  the  base  ring 
by  60  screws  set  below  the  surface  of  the  bottom  of  the  teeth.  Trav- 
ersing pinion  is  keyed  and  secured  by  a  castellated  nut  to  the  trav- 
ersing pinion  shaft.  The  latter  has  two  roller  bearings  and  one 
ball-thrust  bearing  in  the  rear  clip  and  traversing  bracket,  which  is 
a  steel  casting  bolted  to  the  rear  transom  and  to  the  racer.  It  also 
provides  two  roller  bearings  for  the  traversing  crank  shaft,  to  which 
is  keyed  a  forged  steel  traversing  crank  shaft  bevel  pinion,  which 
engages  in  a  cast-iron  gear  keyed  and  secured  by  castellated  nut  to 
the  upper  end  of  the  traversing  pinion  shaft.  A  traversing  crank  is 
secured  by  a  split  pin  to  the  right  extremity  of  the  crank  shaft  out- 
side of  the  chassis.  The  traversing  crank  is  easily  removable,  and 
hooks  for  it  when  not  in  use  are  provided  on  the  chassis. 

The  slow-motion  traversing  gearing  consists  essentially  of  a  hand- 
wheel,  shaft,  and  gears ;  intermediate  shaft;  clutch  gears,  plunger,  rod, 
fork,  and  fork  lever;  foot  lever;  spring  stirrup  and  spring,  and  the 
necessary  bearings.  The  handwheel  is  attached  to  the  right  end  of 
its  shaft,  which  is  connected  to  the  traversing  intermediate  shaft. 
The  intermediate  shaft  is  keyed  to  a  bevel  gear,  which  engages  in  a 
pinion  secured  to  the  handwheel  shaft  near  the  handwheel.  The 
upper  end  of  the  intermediate  shaft  is  supported  by  a  ball-thrust 
bearing  in  the  upper  traversing  bearing,  which  is  bolted  to  the  sight 
standard.  The  lower  end  of  the  intermediate  shaft  passes  through  a 
bushing  in  the  lower  traversing  bearing  which  is  bolted  to  the  left 
chassis  at  the  traversing  crank  shaft.  There  is  keyed  to  its  lower 
extremity  a  forged-steel  clutch  bevel  pinion.  The  cast-iron  gear  in 
which  it  engages  is  bronze  bushed  and  is  free  to  rotate  on  the  travers- 
ing crank  shaft.  The  traversing  clutch  is  a  bronze  collar  having  a 
sHding  fit  over  two  keys  on  the  crank  shaft  to  the  left  and  outside  of 
the  clutch  gear.  Six  30°  lugs  on  its  right  end  engage  between  corre- 
sponding ones  on  the  left  end  of  the  hub  of  the  gear. 

The  clutch  mechanism  is  for  the  purpose  of  moving  the  clutch  in 
and  out  of  engagement  with  the  clutch  gear.  When  engaged  the 
rotation  from  the  sighting  platform  of  the  clutch  gear  is  transmitted 
to  the  crank  shaft  and  traversing  pinion ;  when  disengaged  the  crank 
shaft  can  be  rotated  in  the  bushing  of  the  clutch  gear  without  move- 
ment of  the  slow-motion  gearing.  It  is  operated  from  the  sighting 
platform  by  pressure  of  the  foot  on  a  plunger  which  actuates  a  series 
of  levers,  moving  the  clutch  into  engagement;  releasing  the  foot  pres- 
sure causes  the  disengagement  under  the  action  of  the  clutch-rod 
spring,  which  returns  the  plunger  to  its  original  position. 


24 

All  gears  of  the  traversing  system  are  provided  with  gear  covers. 
Oil  holes  are  provided  for  lubrication. 

Sighting  Platforms. — Two  sighting  platforms  are  provided,  one 
on  each  side  of  the  carriage.  Means  for  traversing  only  are  provided 
by  a  handwheel  operated  from  the  left  platform. 

Sight. — The  sight  with  which  carriages  Nos.  20  and  21  are  equipped 
is  the  3-inch  telescope  sight,  model  of  1904,  which,  together  with 
its  cradle  and  sight  arm,  is  described  in  Form  1955.  The  sight  arm 
is  mounted  on  a  sight-arm  bracket,  which  is  in  turn  mounted  on  the 
upper  end  of  the  sight  standard. 

The  sight  standard  is  of  cast  steel.  The  upper  end  of  the  sight 
standard  is  turned  to  a  diameter  of  6.497  inches  for  a  height  of  6 
inches,  below  which  is  a  flange  with  two  set  screws  in  front  screwed 
into  lugs  2.5  inches  apart.  The  sight-arm  bracket  is  of  cast  steel  with 
a  socket  at  the  rear  bored  to  fit  the  upper  end  of  the  sight  standard. 
An  arm  projects  to  the  front  25.44  inches,  having  at  the  extremity  a 
double  bearing  for  the  sight-arm  bracket  pin  which  passes  through 
the  hole  in  the  forward  end  of  the  sight  arm.  A  lug  at  the  base  of 
the  sight-arm  bracket  is  engaged  by  the  set  screws  of  the  sight  stand- 
ard, which  enables  the  Hne  of  sight  to  be  brought  into  exact  parallel- 
ism, with  the  bore  of  the  gun  with  respect  to  azimuth.  To  make  the 
adjustment,  point  the  gun  at  a  distant  object  (about  6,000  yards  away, 
if  practicable)  by  means  of  a  bore  sight,  set  the  deflection  scale  of  the 
telescopic  sight  at  0,  then  bring  the  sight  on  the  target  by  means  of 
the  set  screws.  Four  tap  bolts  are  screwed  into  the  sight  standard 
through  holes  in  the  flange  at  the  base  of  the  sight-arm  bracket. 
These  holes  are  0.188  inch  in  diameter  larger  than  the  bolts,  which 
allows  sufficient  play  to  make  the  desired  adjustment,  after  which 
the  screws  should  be  tightened  and  the  adjustment  verified. 

Two  lugs  project  upward  from  the  rear  of  the  sight-arm  bracket 
and  afford  a  double  bearing  for  a  second  sight-arm  bracket  pin  pass- 
ing through  the  sight  arm.  In  this  case  the  cradle  movement  in 
elevation  is  merely  for  the  purpose  of  bringing  the  target  into  the 
field  of  the  telescope. 

Carriages  after  No.  21  are  equipped  with  3-inch  telescopic  sight,, 
model  of  1912,  described  in  pamphlet  No.  1959.  The  cradle  yoke  is 
mounted  on  the  sight  bracket,  which  is  in  turn  mounted  on  the  sight 
standard. 

The  sight  standard  for  these  carriages  is  capped  by  a  round  flange 
12  inches  in  diameter,  to  which  the  cast-steel  sight  bracket  is  bolted. 
The  cradle  yoke  is  bolted  to  the  sight  bracket,  and  adjustment  in 
azimuth  for  bore  sighting  is  provided  for  by  elongated  bolt  holes 
in  the  rear  end  of  the  sight  bracket. 

Electrical  Equipment  (Plates  VI  and  VII). — Plates  VI  and  VII 
show  the  plan  of  the  electrical  equipment  and  the  wiring  diagram. 


25 

Lighting  Circuits. — The  power  for  lighting  is  obtained  from  the 
power  mains  of  the  emplacement  through  lead-covered  cables  which 
enter  a  terminal  box  at  the  rear  of  the  pit.  From  that  point  it  is 
distributed  by  insulated  wires  with  flexible  metallic  and  insulated 
wrought-iron  pipe  conduits  to  four  8-candlepower  lamps,  one  at  the 
azimuth  pointer,  one  at  the  elevation  pointer,  one  at  the  recoil  valve, 
and  one  at  the  buffer  valve;  to  three  16-candlepower  lamps,  one  on 
each  chassis  and  one  at  the  rear  transom;  to  one  portable  16-candle- 
power lamp  at  the  rear  end  of  the  right  transom;  and  to  two 
2-candlepower  lamps  on  the  telescopic  sight.  The  2-candlepower 
lamps  are  for  the  illumination  of  the  cross  wires  and  the  deflection 
scale.  All  lamps  are  110  volts,  in  parallel.  Where  emplacements 
are  equipped  with  power  at  220  volts,  lamps  are  placed  in  parallel 
series  of  two  lamps  each. 

The  azimuth  and  elevation  pointer  lamps  and  the  buffer  and 
recoil  valve  lamps,  as  well  as  those  for  illuminating  the  sight,  are 
controlled  by  a  single  snap  switch  on  the  lamp  fitting  of  the  elevation 
pointer  lamp  at  the  rear  of  the  carriage;  the  chassis  lamps  and  the 
lamp  at  the  rear  transom  are  provided  with  key  sockets  for  their 
control.  The  portable  lamp  has  a  snap  switch  on  its  base.  Cross 
wires  of  the  sight  are  provided  with  a  mechanical  dimmer,  by  which 
the  lamp  is  occulted  to  any  desired  degree. 

The  portable  water-tight  lamp  is  for  general  use  within  the  limit 
of  its  reach.  The  lamp  itself  is  covered  by  a  globe  of  heavy  glass 
seated  in  a  bronze  base,  to  which  is  attached  a  handle.  The  flexible 
steel  conduit  containing  the  conductors  passes  through  this  handle. 
A  substantial  wire  guard  surrounds  the  globe  and  is  attached  to  the 
base. 

Firing  Circuits. — The  gun  may  be  fired  either  electrically  or  by 
lanyard.  The  current  for  firing  electrically  is  obtained  either  from  a 
battery  of  dry  cells  carried  in  a  box  supported  in  a  bracket  attached 
to  the  underside  of  the  sighting  platform,  in  which  case  the  firing 
circuit  is  closed  through  a  firing  pistol  mounted  on  a  bracket  bolted 
to  the  upper  traversing  bearing,  above  the  left  sighting  platform,  or 
from  a  hand-operated  alternating  current  magneto  mounted  on  the 
firing-pistol  bracket  in  place  of  the  firing  pistol,  the  dry-cell  battery 
being  dispensed  with. 

When  using  the  battery  the  gunner  may  determine  whether  the 
circuit  is  complete  without  actually  firing  a  primer  by  pressing  a 
projecting  button  on  the  pistol,  thereby  closing  the  firing  circuit 
through  a  coil  of  high  resistance,  which,  with  the  voltage  ordinarily 
used,  permits  the  passage  of  sufficient  current  to  operate  a  buzzer, 
but  not  sufficient  to  endanger  the  firing  of  the  primer. 

A  circuit  breaker  on  the  breech  of  the  gun  prevents  the  possible 
firing  of  the  gun  electrically  except  w^^en  the  breechblock  is  fully 
9979—17 4 


26 

closed  whether  the  gun  be  in  the  loading  or  in  the  firing  position. 
A  safety  firing  switch  on  the  carriage  prevents  the  possible  firing 
of  the  gun  electrically  except  when  fully  into  battery  or  nearly  so. 
This  device  consists  of  a  double-pole,  single-throw  switch,  the  parts 
of  which  are  separated  by  the  recoil,  one  part  being  attached  to  the 
chassis,  the  other  part  to  the  top  carriage.  The  part  attached  to  the 
chassis  is  so  arranged  that  when  the  top  carriage  recoils  it  drops  out 
of  position,  so  that  on  counter  recoil  contact  is  not  made  until  this 
part  is  raised  into  position  by  a  lever  on  the  outside  of  the  left  chassis. 

The  gun  is  fired  by  lanyard  from  the  loading  platform.  A  safety 
device  has  been  added  to  prevent  the  possible  firing  of  the  gun  by 
lanyard  except  when  fully  in  battery  or  nearly  so.  The  device  con- 
sists of  a  short  lanyard  running  from  the  primer  to  a  ring  at  the  end 
of  a  copper  cable  wound  on  a  reel.  The  reel  is  carried  in  a  housing 
attached  to  the  rear  face  of  the  elevating  band  on  the  gun.  One 
end  of  the  firing  lanyard  is  attached  to  the  ring  on  the  copper  cable^ 
the  other  is  held  by  the  cannoneer  who  is  to  fire  the  piece.  The  short 
lanyard  can  be  pulled  to  the  rear  so  as  to  fire  the  primer  only  by  first 
imwinding  the  copper  cable  from  the  drum.  This  is  prevented  while 
the  gun  is  from  battery  by  the  action  of  a  pawl  which  engages  a  ratchet 
on  the  drum.  When  the  gun  rises  into  battery,  this  pawl  is  auto- 
matically tripped  by  a  cam  attached  to  the  rear  face  of  the  elevating 
arm.  This  permits  the  reel  to  be  unwound  and  the  pull  to  thus  come 
upon  the  short  lanyard  attached  to  the  primer. 

The  reel  is  provided  with  a  spiral  spring  which  causes  it  to  rotate 
and  wind  up  the  copper  cable  as  soon  as  the  pull  upon  the  lanyard 
is  released.  The  initial  tension  of  this  spring  should  be  such  as  to 
cause  the  copper  cable  to  be  wound  up  with  certainty  with  the  lan- 
yard attached.  Should  the  initial  tension  be  much  in  excess  of  the 
proper  amount,  the  spring  may  become  woimd  solid  before  sufficient 
cable  has  been  unwound  to  permit  the  firing  of  the  primer.  Too  much 
tension  on  the  spring  is  otherwise  objectionable,  since  it  brings  un- 
necessary strains  on  the  parts  when  the  reel  automatically  winds  up. 

Should  the  tension  of  the  spring  require  adjustment,  it  may  be 
done  as  follows:  Loosen  the  nut  on  the  spring  shaft  projecting  from 
the  center  of  the  case;  hold  with  a  screw  wrench  the  square  end  of 
the  shaft  to  prevent  the  spring  from  unwinding;  remove  the  spring 
shaft  pin,  and,  by  means  of  the  wrench,  turn  the  spring  shaft  in 
such  direction  as  to  increase  or  decrease  the  tension  as  required. 
Holes  are  provided  wherein  the  pin  may  be  inserted  at  any  quarter 
turn  of  the  shaft. 

A  safety  device  on  the  firing  mechanism  proper  prevents  possible 
firing  of  the  primer  by  lanyard  until  the  breechlock  is  locked,  whether 
the  gun  be  in  the  loading  or  in  the  firing  position. 


27 

Shot  Trucks. — Four  shot  trucks  are  furnislied  with  eacli  carriage 
for  bringing  projectiles  to  the  gun.  Each  truck  carries  six  projectiles. 
They  are  to  be  taken  from  the  truck  and  inserted  in  the  gun  by  hand. 
All  shot-truck  wheels  are  equipped  with  rubber  tires,  set  in  grooves 
on  the  wheels,  and  vulcanized  in  position. 

Shot  Tongs. — Each  battery  is  provided  with  one  pair  of  shot 
tongs  with  each  shot  trolley  installed,  and  a  reserve  of  two  pairs  for 
the  battery.  In  order  to  provide  tongs  having  a  small  height  over 
all  and  thus  to  increase  the  amount  of  possible  hoist  in  the  galleries 
of  the  emplacement,  the  tongs  are  designed  with  a  lock  which  must 
be  operated  by  hand  before  they  will  grip  a  projectile.  This  lock 
consists  of  a  dog,  the  inner  end  of  which  presses  against  the  top  of 
the  projectUe  while  the  outer  side  is  held  by  a  U-shaped  piece  rotated 
into  position  after  the  tongs  have  been  placed  on  the  projectile. 

Grease  Cups. — ^Ten  grease  cups  are  provided  for  lubricating  the 
heavy  bearings  of  the  gun  levers  and  the  front  and  rear  bearing  sur- 
faces of  the  vertical  guides,  with  the  heavy  grease  necessary  for  this 
purpose.  The  grease  cup  consists  essentially  of  a  body  for  carrying 
the  grease  and  a  cap  carrying  a  piston  actuated  by  a  coiled  spring. 
When  the  cap  is  screwed  down  over  the  body  of  the  cup,  the  piston 
bears  against  the  grease.  By  further  movement  of  the  cap  the  spring 
in  rear  of  the  piston  is  compressed,  thus  putting  a  sustained  pressure 
on  the  grease.  This  cap  should  habitually  he  Tcejpt  screwed  down  so  as 
to  maintain  a  clearance  of  about  0.25  inch  between  its  face  and  the  face 
of  the  nut  on  the  projecting  piston,  affording  a  visible  indication  that 
the  grease  is  being  forced  into  the  bearing. 

Implements. — Each  carriage  is  equipped  with  the  wrenches,  screw 
drivers,  lifting  hooks,  pinch  bars,  and  oil  cans  required  for  its  mount- 
ing and  care.  These  parts,  except  those  too  large,  are  stored  in  an 
armament  chest,  together  with  the  necessary  implements  for  the  gun. 


INSTKUCTIONS  FOR  ASSEMBLING  THE  CARRIAGE. 


General  Remarks. — ^The  carriage  is  dismounted  for  shipment,  the 
heavy  parts  being  separated,  the  finished  surfaces  slushed  and  cov- 
ered with  boards.  The  chassis  and  transoms  are  sometimes  shipped 
assembled.  The  small  parts  are  disassembled  sufficiently  for  boxing 
them  conveniently.  Except  where  impracticable  on  account  of  the 
size  or  other  characteristics,  each  part  bears  a  piece  mark  shown  on 
the  drawing  near  the  designation  of  the  part.  The  first  number  of 
this  piece  mark  indicates  the  drawing  on  which  the  part  is  detailed. 
Where  it  is  possible  to  assemble  the  parts  in  more  than  one  way,  they 
are  sometimes  marked  to  indicate  the  way  in  which  they  were  assem- 
bled during  shop  test — as,  for  instance,  the  two  ends  of  two  distance 
ring  sections  which  adjoin  are  marked  with  the  same  number.  The 
shipping  list  itemizes  the  contents  of  each  box. 

The  following  approximate  weights  are  given  as  a  guide  in  assem- 
bling and  handling  the  parts: 


Part. 


Weight. 


Base  ring,  with  traversing  rack 

Distance  ring,  four  sections,  without  rollers 

Racer 

Chassis 

Front  transom 

Rear  transom 

Guide  frame,  each , 

Piston-rod  beam 

Vertical  guide,  each 

Guide  bracket,  each 

Sight  standard 

Top  carriage 

One  roller  cage,  with  rollers 

Bottom  plate 

Counterweight,  largest  piece 

Recoil  cylinder,  with  cylinder  heads 

Piston  rod .' 

Crosshead,  with  guide  clips 

Sighting  platform 

Elevating  arm 

Elevating  band 

Gun  levers,  axle,  yoke,  etc 

Counter-recoil  buffer,  assembled 

Gears,  shafts,  brackets,  cranks,  and  other  parts  not  mentioned  above,  about 
Total  weight  (unboxed),  about 


Pounds. 

8,000 

1,000 

6,000 

6,000 

925 

2,200 

1,000 

750 

600 

550 

1,050 

2,600 

350 

3,300 

4,200 

970 

350 

3,200 

550 

650 

320 

6,400 

350 

7,500 

92,000 


In  assemhling  the  carriage  no  part  sJiould  he  directly  strucTc  with  a 
steel  hammer  or  sledge.  A  wooden  buffer  should  he  used  on  the  part 
to  he  struck,  or  soft-metal  drifts  or  hammers  should  he  used.  In  han- 
dling parts,  care  must  he  exercised  that  machined  surfaces  do  not  hecome 
hurred.  All  hearing  surfaces  should  he  clean,  smooth,  and  well  lubri- 
cated prior  to  being  brought  together. 

(28) 


29 

The  assembling  of  the  carriage  requires  the  use  of  such  blocking, 
way  plank,  hydraulic  jacks,  ropes,  and  pulleys  as  are  usually  found 
at  seacoast  forts.  In  addition  to  these  a  derrick  or  shears  capable  of 
safely  lifting  4  or  5  tons  will  be  found  very  useful. 

Instructions  for  Assembling. — Carriages  should  be  mounted 
under  the  immediate  supervision  of  an  ordnance  machinist  famihar 
with  the  work,  so  that  the  following  instructions  are  intended  to  be 
general  only. 

Base  Ring. — Move  the  base  ring  into  position  over  the  pit  by 
means  of  the  derrick  or  by  skids  and  rollers,  placing  the  part  marked 
*' Front"  in  the  axis  of  the  emplacement.  Place  a  thrust  plate  on 
each  holding-down  bolt  in  such  position  as  to  receive  the  thrust 
from  the  leveling  screws.  Clean  and  oil  the  threads  of  the  holding- 
down  bolts,  then  lower  the  base  ring,  exercising  great  care  not  to 
burr  these  threads. 

The  base  ring  should  be  supported  by  the  leveling  screws  so  as 
to  leave  an  opening  underneath  sufficiently  wide  for  satisfactory 
grouting. 

Leveling. — The  base  ring  should  be  carefully  leveled  by  means 
of  an  accurate  straightedge  and  a  well-adjusted  machinist's  level. 
The  straightedge  should  be  used  on  the  roller  path  by  resting  it  on 
the  inner  edge  with  no  blocks  or  other  supports.  The  level  should 
be  reversed  in  every  position  and  the  mean  position  of  the  bubble 
taken  as  the  correct  one. 

Preliminary  leveling  may  be  done  from  the  azimuth  circle  by  sup- 
porting one  end  of  the  straightedge  on  blocking  in  the  center  of  the 
pit,  but  the  final  adjustment  should  be  verified  by  readings  taken  on 
the  roUer  path  as  described  above.  At  the  conclusion  of  the  leveling, 
moderately  tighten  all  holding-down  bolts,  verify  the  level,  then  add 
a  grouting  of  neat  Portland  cement.  Care  must  be  exercised  that 
this  completely  fills  the  entire  space  under  the  base  ring.  No  weight 
should  be  added  to  the  base  ring  until  the  grouting  has  thoroughly 
set.     The  leveHng  screws  should  then  be  backed  off  two  turns. 

Distance  Ring  and  Traversing  Rollers. — Carefully  clean  all 
parts,  assemble  the  roUers  in  their  bearings,  with  the  distance  ring 
in  place,  and  run  the  system  around  by  hand  to  see  that  aU  parts 
operate  freely. 

Racer. — ^Move  the  racer  into  position,  clean  the  roller  path  and 
pintle  surface,  then  carefully  lower  into  position  on  the  traversing 
rollers.  Care  should  be  exercised  not  to  injuriously  rub  or  cramp 
the  pintle  surfaces  during  the  lowering.  Assemble  the  outer  and 
inner  dust  guards  and  the  covers  for  openings  in  racer  in  order  to 
prevent  the  possible  entrance  of  dirt  or  metal  chips.  The  racer 
should  then  be  run  around  by  hand  to  determine  whether  it  be 
entirely  free  in  its  operation. 


30 

Front  Clips  may  now  be  bolted  in  place. 

Chassis  and  Guide  Frames. — Place  either  chassis  in  position, 
dowel,  key,  and  bolt  it  to  the  racer.  The  rear  of  the  racer  may  be 
identified  by  its  being  beveled  for  the  rear  transom.  Lower  its  guide 
frame  into  position  and  bolt  it  to  the  underside  of  the  chassis.  Pro- 
ceed similarly  for  the  other  chassis  and  its  guide  frame. 

PiSTON-RoD  Beam  should  then  be  attached  to  the  lower  ends  of  the 
guide  frames. 

Vertical  Guides  are  then  added.  A  series  of  circles  about  J 
inch  in  diameter  are  located  on  the  center  of  the  right-hand  guide 
about  2  feet  apart,  as  measuring  points  for  paraQelism  of  guides. 

The  Front  and  Rear  Transoms  are  bolted  in  place. 

Bottom  Plate. — ^Place  blocking  in  the  counterweight  well  to 
within  18  inches  of  the  base  ring,  being  careful  to  leave  the  center  of 
the  bottom  plate  uncovered  as  well  as  the  holes  for  the  four  suspen- 
sion rods.  The  bottom  plate  should  be  laid  on  this  blocking,  the  clips 
on  it  engaging  the  vertical  guides.  It  should  be  carefully  leveled  to 
prevent  distortion  of  the  bronze  gibs. 

Recoil  Cylinder,  with  the  lower  cylinder  head,  should  be  placed 
on  the  bottom  plate  and  secured  to  it. 

Counterweight  is  then  piled  and  the  suspension  rods  inserted  and 
secured  to  the  bottom  plate. 

Crosshead  is  then  added  from  above.  If  the  upper  end  of  the  re- 
coil cylinder 'is  found  not  to  be  exactly  in  position  with  respect  to  its 
bore  in  the  crosshead  the  bottom  plate  should  be  tipped  slightly  as 
necessary  by  means  of  jacks  applied  to  its  underside. 

Retracting  and  Tripping  Gear. — The  retracting  and  tripping 
gear  are  then  assembled.  After  this  is  done,  the  crosshead  may  be 
attached  to  the  counterweight  by  means  of  the  suspension  rods. 
No  attempt  should  be  made  to  lift  the  counterweight  with  the  re- 
tracting gear  before  the  gun  is  in  place. 

Piston  Rod  and  Upper  Cylinder  Head  are  then  placed. 

Counter-Recoil  Buffers  and  Roller  Cages  should  now  be 
added,  the  latter  being  so  placed  that  the  zero  marks  on  rack  teeth 
and  recoil  roUer  teeth  coincide. 

Top  Carriage  should  be  lowered  into  its  forward  position  from 
above  so  that  the  gears  will  all  engage  properly. 

Gun  Levers  are  then  added,  the  top  carriage  being  run  rearward 
for  this  purpose,  and  the  lower  ends  secured  to  the  crosshead  by  the 
gun-lever  pins. 

The  Gun  with  Elevating  Band  attached  is  then  put  in  place. 

The  remaining  parts  of  the  carriage  may  now  be  assembled  as  con- 
venient, including  the  elevating  arm,  slide,  etc. ;  guide  brackets,  sight 
standard,  piston-rod  brackets,  elevating  and  traversing  gearing,  sight 
platform,  sights,  electrical  equipment,  recoil  and  buffer  valves. 


31 

After  the  gun  and  elevating  arm  are  in  place,  the  gun  may  be  re- 
tracted slightly,  freeing  the  blocking  under  the  counterweight,  the 
blocking  removed,  and  the  carriage  run  slowly  into  battery  by  means 
of  the  retracting  cranks.  This  will  permit  the  attaching  of  those 
parts  which  require  the  gun  to  be  in  battery. 

Important  Points. — ^After  the  carriage  has  been  completely  as- 
sembled and  the  gun  mounted,  the  recoil  and  buffer  cylinders  filled, 
and  the  valves  set  as  indicated  in  the  description  of  the  carriage,  the 
following  points  should  be  noted,  namely: 

1.  Traverse  the  carriage  to  the  extreme  position  in  both  directions 
to  see  that  it  moves  freely  and  that  traversing  stops  are  properly 
located. 

2.  Elevate  and  depress  the  gun  to  the  extreme  limits  to  see  that  the 
parts  operate  freely  and  that  the  depression  stop  is  properly  located. 

3.  Retract  the  gun  while  in  its  extreme  positions  against  the  azi- 
muth stops  to  determine  whether  there  be  any  interferences  for  recoil 
in  such  positions. 

4.  Examine  and  clean  out  all  oil  holes,  noting  that  they  have  oil 
plugs. 

5.  See  that  there  is  not  a  hard  bearing  between  the  rimbases  of  the 
gun  and  gun  levers. 

6.  See  that  the  elevating  arm  and  band  are  properly  assembled,  the 
clearances  on  each  side  being  the  same,  and  the  arms  not  sprung  or 
twisted. 

7.  See  that  the  chassis  rails  and  guide  clips  have  not  been  burred. 

8.  See  that  the  dust  guard  does  not  bear  against  the  distance  rings 
or  racer. 

9.  Adjust  the  buffer  valve  until  the  gun  rises  as  promptly  as  pos- 
sible into  battery  without  striking  the  stops  with  force. 

10.  See  that  the  pawls  engage  simultaneously  and  that  the  re- 
tracting gearing,  tripping  gearing,  and  the  safety  latches  function 
properly. 

11.  Set  the  elevation  pointer  by  the  use  of  a  clinometer  supported 
by  a  rest  in  the  muzzle  of  the  gun,  dowel  pin  it  in  position,  and  verify 
the  graduation. 

12.  Orient  the  gun,  add  numbers  to  the  degree  marks  on  the  azi- 
muth circle,  adjust  azimuth  pointer  to  indicate  correct  azimuth,  and 
dowel  pin  it  in  position.  Muzzle  at  true  south  is  0  degrees  in  azi- 
muth and  numbers  are  placed  around  clockwise  to  include  359. 

13.  Adjust  the  sight-arm  brackets  so  that  the  telescope  will  be 
parallel  to  the  bore  of  the  gun,  as  described  previously  in  connection 
with  the  sight. 

14.  See  that  the  electrical  connections  have  been  properly  made,  by 
trying  the  lights  and  firing  the  primer. 


CARE   OF  CARRIAGE. 


General  Instructions. — Carriages  should  be  traversed  from  time 
to  time  throughout  their  entire  allowed  movement.  They  should  not 
be  allowed  to  stand  for  long  periods  at  a  particular  azimuth,  as  this 
might  cause  uneven  settling  of  the  platform. 

The  habitual  position  of  guns  on  disappearing  carriages  is  '^from 
battery,"  but  at  intervals  the  gun  should  be  allowed  to  rise  to  the 
firing  position  and  be  elevated  and  depressed  within  the  limits  of  the 
stops. 

It  is  required  that  all  parts  of  carriages  he  Icept  free  from  rust  at  aU 
times.  If  this  be  allowed  to  accumulate,  its  removal  from  bearing 
parts,  and  especially  piston  rods,  requires  particular  attention,  in 
order  that  clearances  may  not  be  unduly  increased.  The  use  of  sand- 
paper for  this  purpose  is  forbidden,  and  emery  cloth  No.  1  should  be 
used,  the  rust  being  softened,  if  necessary,  by  kerosene. 

The  retracing  wire  ropes  should  at  all  times  be  kept  well  oiled  with 
raw  linseed  oil. 

If  any  leakage  occurs  from  the  hydraulic  recoil  system,  it  should 
be  immediately  remedied,  calling  if  necessary  upon  the  district  arma- 
ment officer  for  the  services  of  skilled  labor. 

The  repacking  of  stuffing  boxes  may  be  done,  when  necessary,  by 
trained  enhsted  men  under  the  supervision  of  an  officer,  but  will 
preferably  be  done  by  skilled  labor. 

Before  removing  a  cylinder  head  containing  a  stuffing  box,  or 
drawing  a  piston  rod  through  a  stuffing  box,  the  pressure  of  the  pack- 
ing on  the  rod  should  be  released  by  unscrewing  the  follower  or  gland 
several  turns. 

The  copper  gaskets  between  cylinders  and  their  heads  should  be  in 
good  condition,  and  consequently  should  be  replaced  whenever  neces- 
sary in  order  to  prevent  leakage. 

Cleaning  Hydraulic  Cylinders. — Recoil  and  buffer  cylinders 
should  be  emptied  and  refilled  at  least  every  three  months,  and  thor- 
oughly cleaned  every  six  months.  For  cleaning,  a  plumber's  hand 
force  pump  is  supplied  to  each  Coast  Artillery  post,  with  about  10 
feet  of  suction  hose  and  15  feet  of  discharge  tube. 

The  following  operations  are  outlined  for  cleaning  the  recoil 
cylinder : 

(a)  Retract  the  gun  sufficiently  to  afford  room  for  working  below 
the  recoil  cylinder,  remove  the  oil  from  the  cylinder  and  the  glands 

and  followers. 

(32) 


33 

(b)  Kemove  the  piston-rod  bracket,  locking  disk,  and  the  upper 
cylinder  head.  Remove  the  lower  piston-rod  nut,  screw  the  upper 
nut  downward,  raising  the  rod  until  the  nut  is  removed.  Allow  the 
rod  to  rest  on  a  block  over  its  hole  in  the  piston-rod  beam. 

(c)  Run  the  gun  slowly  into  battery  by  means  of  the  retracting 
cranks,  raising  the  ratchet  pawls,  and  give  the  gun  its  maximum 
elevation.  Raise  the  piston  rod  vertically  until  its  upper  end  strikes 
the  gun,  then  incline  it  to  one  side  and  remove  it  from  the  cylinder. 

{d)  Thoroughly  clean  the  cylinder  from  its  upper  end  with  kero- 
sene oil  forced  in  with  the  hand  pump,  then  wipe  dry  with  clean  cotton 
waste.  Clean  also  the  cylinder  heads,  glands,  and  followers;  and  the 
piston  rod  inside  and  out,  removing  the  recoil  valve. 

(e)  After  the  removal  or  evaporation  of  all  kerosene  oil,  reassemble 
the  parts  and  refill  the  cylinder  with  hydrolene  oil,  carefully  inspect 
all  parts  which  were  dismounted,  and  complete  the  retraction  of  the 
gun. 

The  following  operations  may  be  outlined  for  cleaning  the  buffer 
cylinders : 

(a)  Remove  the  glands,  stuffing  boxes,  and  pistons;  and  also  the 
gland,  valve  stem,  and  emptying  plug  of  the  buffer  valve. 

(b)  Clean  the  cylinders  as  described  for  the  recoil  cylinder.  The 
equalizing  and  throttling  pipes  should  also  be  thoroughly  cleaned  by 
forcing  the  oil  into  them  with  the  pump,  permitting  it  to  run  out 
through  the  emptying  hole. 

(c)  After  the  removal  or  evaporation  of  all  kerosene  oil,  reassemble 
the  parts  and  refill  the  cylinders  with  hydrolene  oil,  after  which  close 
the  buffer  valve  to  its  normal  setting. 

Removing  Packing  from  Stuffing  Boxes. — ^A  packing  extractor 
for  removing  packing  from  the  stuffing  boxes  of  the  recoil  cylinder  is 
issued  to  each  post  at  which  these  carriages  are  mounted.  To  use 
the  extractor,  the  gun  must  be  retracted  sufficiently  to  afford  access 
to  the  stuffing  boxes.  Close  the  extractor  around  the  piston  rod  and 
insert  the  locking  pin,  turn  the  extractor  counter-clock  wise,  pressing  it 
against  the  packing  until  the  needles  are  firmly  engaged.  Draw  the 
packing  out,  turning  slowly  counter-clock  wise.  Extractor  bars  are 
provided  for  use  in  starting  the  packing  from  its  seat  by  inserting 
the  toes  of  the  bars  in  the  rack  teeth  and  prying  over  the  edge  of  the 
box,  being  careful  not  to  injure  it. 

The  packing  of  the  buffer  cylinders  and  of  the  buffer  valve  can 
generally  be  removed  with  any  pointed  instrument  by  merely  remov- 
ing the  glands.  In  case  of  difiiculty,  the  stufiing  boxes  of  the  former 
can  be  removed  and  the  packing  taken  out  with  the  finger;  and  in  the 
latter,  the  valve  stem  may  be  removed. 


34 

Repacking  Stuffing  Boxes. — ^Examine  the  old  packing  and  dis- 
card all  unfit  for  use.  If  any  of  the  old  packing  is  used,  it  should  be 
put  in  after  the  new. 

To  repack  a  stuffing  box  after  the  packing  has  been  removed,  insert 
one  ring  of  packing  and  force  it  well  to  the  bottom  of  the  box  by  a 
wooden  stick  and  mallet.  Treat  each  layer  of  packing  in  a  similar 
manner,  being  careful  that  successive  rings  break  joints.  Six  rings 
of  packing  are  required  for  each  stuffing  box  of  the  recoil  cylinder, 
five  rings  for  each  stuffing  box  of  the  buffer  cylinders,  and  four  rings 
for  the  buffer  valve. 

In  screwing  up  the  glands  or  followers,  no  other  tools  should  he 
used  than  those  provided  for  the  purpose,  nor  should  excessive  force 
he  applied  to  them,  such  as  the  addition  of  a  pipe  to  the  handle  of  the 
wrench.  Care  should  be  exercised  in  tightening  the  glands  to  advance 
all  of  the  bolts  evenly  so  as  not  to  throw  the  gland  out  of  alignment. 
It  will  be  found  necessary  to  tighten  the  glands  of  the  buffer  cylinders 
but  slightly.  Attention  is  invited  to  the  caution  given  in  regard  to 
this  under  the  description  of  the  counter-recoil  huffers. 

It  is  to  be  expected  that  a  slight  amount  of  oil  will  soak  through 
and  drip  from  boxes  of  carriages  when  not  in  use.  Also  when 
tightening  the  followers  a  slight  amount  of  oil  will  squeeze  out  of  the 
saturated  packing.  This  oil  should  be  caught  and  not  allowed  to 
render  the  carriage  unsightly. 

Filling  Cylindeks. — To  fill  the  recoil  cylinder,  remove  the  filhng 
plug  and  pour  clean  hydrolene  oil  into  it  through  a  funnel  until  the 
oil  overflows.  Allow  any  air  that  may  he  present  to  escape,  then 
pour  in  more  oil  until  the  cylinder  is  again  filled.  About  7.5  gallons 
are  required.  The  cylinder  should  be  filled  with  the  gun  slightly  out 
of  the  recoiled  position. 

To  fill  the  buffer  cyfinders,  remove  both  filling  plugs  and  pour 
clean  hydrolene  oil  through  a  funnel  into  one  cylinder,  allowing  the 
air  to  escape  from  the  other,  until  both  cylinders  are  filled.  AUow 
any  air  that  may  he  present  to  escape  and  pour  in  more  oil  until  the 
system  is  again  filled.     A  full  gallon  of  oil  is  required. 

Service  Condition  (Lubrication,  etc.). — When  the  carriage  is 
to  be  kept  in  readiness  for  service,  and  is  in  daily  or  frequent  use, 
aU  bearing  parts  must  be  kept  thoroughly  cleaned  and  lubricated. 
Especial  attention  should  be  given  to  the  lubricating  of  trunnion 
beds,  roUers,  pintle  surfaces,  shaft  bearings,  and  sliding  surfaces; 
gun-lever  axle  beds,  gun-lever  pins,  elevating  screw,  elevating  band 
trunnions,  crosshead  guides,  and  the  elevating,  traversing,  tripping, 
and  retracting  mechanisms,  including  the  teeth  of  all  gears. 

The  ahove  parts  should  he  lubricated  at  frequent  intervals,  whether 
the  carriage  is  maneuvered  or  not.      When  carriages  are  in  use  for 


35 

daily  drills  a  thorougTi  lubrication  twice  each  weeJc  should  he  sufficient 
for  all  hut  the  most  severely  used  parts. 

Proper  lubricating  and  cleaning  of  the  traversing  rollers  and  their 
paths  are  essential  to  free  working  of  the  carriage.  The  dust  guards 
should  be  removed  to  clean  the  upper  roller  paths.  By  removing  the 
cover  plates  on  the  racer  the  traversing  rollers  may  be  lifted  out  with 
their  bearings  for  cleaning  and  for  cleaning  the  lower  roller  path. 

Four  oil  plugs  are  screwed  into  steel  tubes  in  the  upper  surface  of 
the  racer,  outside  of  the  front  and  rear  of  each  chassis,  which  are 
provided  with  passages  to  the  pintle  surface.  Eight  oil  plugs,  two 
at  each  of  the  above  points,  are  also  provided,  connected  to  brass 
tubes  reaching  down  to  the  oil  grooves  of  the  distance  ring,  thus  pro- 
viding lubrication  for  the  bearings  of  the  rollers.  Six  additional  of 
such  oil  pipes  are  also  provided,  two  each  at  the  front,  right,  and 
left  of  the  racer  for  exceptional  use  in  lubricating  the  roller  bearings. 
They  are  closed  by  countersunk  screws.  For  oiling  the  rollers  or 
pintle  through  these  holes  the  carriage  must  he  traversed  in  order  to 
distribute  the  oil  through  the  entire  circumference. 

It  will  occasionally  be  necessary  to  examine  all  ball  and  roller 
bearings  to  see  that  the  dust  guards  are  in  proper  place  and  that 
the  rollers  themselves  are  clean.  If  they  be  found  dirty,  they  may 
be  flushed  with  kerosene  oil;  but  care  must  be  taken  to  fill  the  bear- 
ings with  synovial  oil  after  the  kerosene  has  drained  away.  If  the 
rollers  have  rusted,  they  must  be  well  removed  and  cleaned. 

Condition  '^In  Ordinary'^  (Not  Ready  for  Immediate 
Service). — If  the  carriage  is  to  remain  unused  for  a  time,  all  un- 
painted  surfaces  should  be  covered  with  a  thin  coat  of  hght  slushing 
oil.  It  can  be  applied  as  in  painting,  using  sash  tool  No.  6,  except 
in  cold  weather,  when  it  should  be  applied  by  stippling,  i.  e.,  light 
tapping,  with  the  brush  held  perpendicular  to  the  surface  to  be 
covered. 

In  all  cases  it  should  he  applied  in  a  thin  coat,  as  this  is  all  that  is 
needed  to  give  good  protection. 

This  oil  is  easily  removed  by  the  use  of  burlap  or  waste  dipped  in 
kerosene  oil.  In  order  to  save  oil,  the  thickest  of  the  slushing  oil 
should  be  well  removed  by  a  scraper  before  applying  the  kerosene. 

Before  applying  the  slushing  oil,  the  surfaces  should  be  thoroughly 
cleaned,  so  as  to  be  entirely  free  from  rust,  water,  kerosene,  or  lubri- 
cating oil,  as  the  first  three  would  cause  rusting  underneath,  and  the 
latter  would  cause  it  to  run  off  when  heated. 

Rollers  and  roUer  paths  should  be  cleaned  and  slushed  from  time 
to  time  and  the  dust  guards  examined  to  see  that  the  felt  strips  are  in 
order  and  make  the  openings  dust  tight. 

Experience  has  shown  that  hydraulic  cylinders  should  not  remain 
empty,  as  in  that  case  the  interior  waUs  soon  become  rusty. 


36 

Oil  Holes. — Oil  holes  should  be  cleaned  out  frequently  to  keep 
them  free  from  sand  and  grit,  and  should  habitually  be  kept  closed  by 
the  screw  plugs  provided,  except  when  in  the  act  of  oiling. 

Before  removing  the  'plug  from  any  oil  hole  carefully  wipe  off  any 
dirt  or  grit  near  the  opening  that  might  he  carried  into  the  hearing 
with  the  oil. 

Compression  Grease  Cups. — Where  compression  grease  cups  are 
provided  similar  precautions  against  dirt  and  grit  must  be  observed. 
When  adding  grease  to  these  cups  do  not  fill  them  completely,  but 
fill  only  to  the  bevel  at  the  top  of  the  cup;  if  too  full,  the  leather 
packing  will  become  inverted  and  will  not  act  effectively.  In  putting 
on  the  cap  see  that  the  leather  packing  enters  the  cup  without  being 
caught  or  bent  by  the  edge  of  the  cup. 

Screw  the  cap  down  on  the  cup  until  the  spring  rod  projects  about 
0.25  inch  above  the  top  of  the  cap.  The  cap  should  be  screwed  down 
from  day  to  day  as  required  to  maintain  about  this  projection  for  the 
rod.     When  the  cap  is  screwed  nearly  home  the  cup  should  be  refilled. 

Oils  and  Grease. — The  Vacuum  Oil  Co.'s  No.  4^  lubricant  is 
issued  for  use  in  the  compression  grease  cups;  it  will  not  be  used  for 
lubricating  any  other  parts,  nor  will  any  other  oil  be  used  in  its  place. 

Light  slushing  oil  is  provided  for  covering  impainted  surfaces  on 
the  gun  and  carriage,  as  well  as  the  bore  of  the  gun,  when  they  are  not 
in  current  use. 

Engine  oil  should  be  used  to  lubricate  the  bearings  where  oil  holes 
and  oil  plugs  are  provided.  It  will  also  be  used  as  a  lubricant  for 
breechblock  threads.  No  other  lubricant  will  be  used  on  such  threads 
during  firings. 

Kerosene  oil  is  issued  by  the  Ordnance  Department  for  cleaning 
purposes  only. 

A  special  grade  of  neutral  oil  called  ^^hydrohne,"  having  a  specific 
gravity  of  about  0.85,  is  furnished  for  filhng  the  recoil  cylinders.  A 
barrel  of  this  oil  should  be  kept  on  hand  to  replace  leakage. 

The  different  kinds  of  oil,  etc.,  will  be  kept  in  receptacles  plainly 
marked  with  their  contents.  The  enlisted  men  should  be  carefuUy 
instructed  in  the  use  of  the  several  kinds  of  oil,  grease,  etc.,  and 
should  be  taught  to  distinguish  one  from  another. 

Oils  must  always  be  kept  in  closed  receptacles  to  prevent  contami- 
nation by  water,  dirt,  etc. 

Oils  which  have  been  used  for  any  purpose  should  not  be  used 
again  without  being  filtered  or  carefuUy  strained.  They  should 
never  be  returned  to  receptacles  containing  new  oils. 

A  suitable  receptacle  should  be  kept  by  each  battery  in  which  oil 
from  cylinders  can  be  placed  and  allowed  to  stand  undisturbed  imtil 
all  sediment  in  it  has  settled.  In  removing  the  oil  great  care  should 
be  taken  that  no  sediment  is  included. 


37 

Mere  discoloration  does  not  affect  the  serviceability  of  the  oil. 

Painting. — In  general,  three  coats  of  paint  will  be  given  car- 
riages the  first  year;  two  coats  annually  thereafter  will  probably 
suffice,  the  actual  needs  depending  somewhat  upon  the  climate  and 
local  conditions.  Before  painting,  surfaces  should  be  rubbed  smooth 
and  made  perfectly  clean  and  dry.  As  soon  as  the  carriage  is  com- 
pletely assembled  and  the  piece  mounted,  all  parts  which  have  been 
marred  in  transportation  will  be  primed,  after  which  one  complete 
coat  of  olive  paint  will  be  applied. 

All  steel  and  iron  nonbearing  surfaces,  both  covered  and  exposed, 
will  be  painted.  This  includes  the  exposed  parts  of  shafts  (except 
squared  ends),  the  exterior  of  the  recoil  cylinder,  and  springs.  Large 
bronze  pieces,  including  the  web  and  spokes  of  wheels,  and  cylinder 
heads  should  also  be  painted. 

The  following  parts  are  not  painted:  All  wearing  or  bearing  sur- 
faces, including  the  handles  of  handwheels  and  cranks,  teeth  of  all 
gears,  the  rollers  and  the  surfaces  on  which  they  travel,  the  piston 
rods,  and  the  vertical  guides,  etc. 

List  of  implements  furnished  for  6-inch  gun,  models  of  1905  and  1908. 

1  rammer  head  and  staff. 

1  sponge  head  and  staff  in  three  sections;  head  to  be  made  to  fit  bore  or  chamber  by 

wrapping  with  burlap. 
1  breech  cover. 

1  combined  tompion  and  muzzle  cover. 
1  slush  brush  to  connect  with  sponge  staff. 
1  wire  cleaning  brush  and  coupling  to  fit  sponge  staff. 

For  allowances  of  cleaning  and  preserving  material,  see  Form 
No.  1869. 

TAst  of  articles  packed  in  the  armament  chest  for  6-inch  guns,  models  of  1905  and  1908,  on 
6-inch  disappearing  carriages,  models  of  1905,  1905  Mi,  and  1905  Mii. 

[Note.— All  articles  marked  *  are  carried  loose  in  chest.] 

For  guns,  model  of  1905-1908: 
1  box  for  firing  mechanism.^ 
3  brushes,  cleaning,  for  primer  seat. 
1  cloth,  emery,  No.  00,  1  quire. 
1  drift,  bronze,  large. 
1  drift,  bronze,  small. 
1  drill,  gunner's. 
3  files,  pillar.  No.  6,  6-inch.2 
3  files,  three-cornered.  No.  4,  6-inch. ^ 
3  files,  half-round,  smooth,  8-inch. ^ 
3  files,  round,  smooth,  8-inch. ^ 
1  file,  flat,  dead  smooth,  8-inch. 
1  file,  round,  second-cut,  8-inch. 

1  For  use  only  with  6-inch  wire-wrapped  gun,  model  of  1908. 

2  For  use  on  bruised  breechblocks.    No  other  files  to  be  used  thereon. 


38 

For  guns,  model  of  1905-1908— Continued. 

1  file,  half-round,  smooth,  8-inch. 

1  file,  three-cornered,  8-inch. 

1  hammer,  boilermaker's. 

1  hammer,  copper. 
*1  lanyard,  gunner's. 

1  mallet,  hand. 

1  mallet,  long  handle. 

1  pliers,  cutting,  7-inch. 
*1  pouch,  gunner's. 

1  punch,  gunner's. 

1  punch,  pin. 

1  reamer,  cleaning,  for  primer  seat. 

1  scraper,  metal, 
''''l  pair  sleeves,  gunner's. 
*3  sponges,  wagon. 
*4  balls  twine,  assorted. 
■^10  pounds  cotton  waste. 
*2  pounds  wire,  copper  No.  12. 
*2  pounds  wire,  copper  No.  16. 

1  wrench,  monkey,  12-inch. 

1  wrench,  monkey,  15-inch. 

1  wrench,  tit,  for  obturator. 
*1  screw  driver,  bar,  for  spindle  key,  gear  segment  screws,  etc.^ 
Implements  for  carriage: 

1  extractor,  gun-lever  pins. 

2  hooks,  counterweight. 
2  hooks,  traveling  roller. 
2  oilers,  half-pint. 

*1  oiler,  locomotive — '1  quart. 

2  pinch  bars. 

1  screw  driver,  commercial,  3-inch  blade. 

1  screw  driver,  commercial,  5-inch  blade, 
''^l  screw  driver  and  socket  wrench. ^ 

1  wrench,  double,  0.375  and  0.5  inch  nuts. 

1  wrench,  double,  0.625  and  0.75  inch  nuts. 

1  wrench,  double,  1  and  1.25  inch  nuts.^ 

1  wrench,  double,  1.5  and  1.75  inch  nuts. 

1  wrench,  double,  2.5  and  2.75  inch  nuts. 

1  wrench,  single,  3-inch  nuts. 

1  wrench,  single,  0.75-inch  nuts. 

1  wrench,  throttling  valve,  and  nut. 
*1  wrench,  buffer  gland  (for  model  of  1905  only). 
*1  wrench,  single,  piston  rod. 

*1  wrench,  spanner,  for  recoil  and  buffer  followers   (models  of  1905-Mi  and 
1905-Mii). 

1  extractor,  piston  rod  and  valve  stem. 

2  extractors,  cylinder,  cylinder  head  and  retraction  clutch  shaft. 
1  extractor  yoke,  cylinder  and  cylinder  head. 

*1  wrench,  "throttling  bar  bolts."     (Model  of  1905-Mii  only.) 

1  For  lanyard  attachment. 

2  To  be  used  for  latch-plate  screws  on  gtin. 

3  Wrench  to  be  used  on  drain  plug  for  models  of  1905-Mi  and  1905-Mji. 


39 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  ofl905-Mii,  their  piece  marls, 
location,  and  material  of  which  they  are  made. 

The  parts  are  listed  alphabetically  under  the  following  headings:  Carriage  proper;  counter-recoil  sys- 
tem; azimuth  pointer;  the  electrical  equipment;  shot  trucks;  shot  tongs;  and  grease  cup. 
When  referrmg  to  a  part,  always  mention  its  piece  mark,  where  given  on  the  list. 

Meaning  of  the  abbreviations  in  the  column  of  material. 


A Ash. 

Br Brass. 

Bz Bronze. 

C Copper. 

CI Cast  iron. 

CS Cast  steel. 

F Felt. 

FS Forged  steel. 

GI Galvanized  iron. 

GS German  silver. 

HR Hard  rubber. 

SR Soft  rubber. 

Mgl Magnet  iron. 

MI Malleable  iron. 

Comm Commercial. 

MM Molded  mica. 


S Steel. 

SB Sheet  brass. 

SS Sheet  steel. 

SpS Spring  steel. 

VF ^ Vulcanized  fiber. 

VR Vulcanized  rubber. 

WI Wrought  iron. 

GWHP Garlock  waterproof 

hydraulic  pack- 
ing. 

FVF Flexible  vulcanized 

fiber. 

PHBZ Phosphor  bronze. 

GP Garlock  packing. 

R Rubber. 


6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mn. 


Piece 

Num- 

mark. 

ber. 

7A1 

2 

1 

1 

1 

1 

1 

1 

H6M 

1 

H6L 

1 

H23K 

1 

H23L 

1 

ni6H 

2 

H16P 

2 

H3D2 

1 

H4C1 

48 

9FA 

1 

H4L 

4 

6N 

2 

6Q 

2 

H6J 

8 

8R 

4 

9D 

6 

19M1 

2 

19N 

1 

H3C 

6 

H4K 

96 

H4M 

104 

H4N 

24 

4H 

14 

5D 

14 

H15E 

2 

H15F1 

24 

6A 

4 

6D 

8 

6T 

2 

6U 

18 

6X 

3 

7B 

8 

7B 

8 

7B 

8 

7T 

4 

8N 

4 

9A 

8 

9J 

18 

9S 

2 

lOE 

4 

H12P 

2 

H13B 

2 

IIR 

2 

13F 

4 

16A 

4 

Name  of  part. 


Location, 


Material. 


Remarks. 


Angles 

Angle  (front).. 
Angle  (inside). 

do 

Angle  (rear)... 
do 


Angle  (outside) 

do 

Axle  cap  (left) 

Axle  cap  (right) 

Ball  thrust  bearing 

do 

Band  tnmnions 

....do 

Base  ring 

Bearings 

Body 

Bolts,  special  with  nuts. 

do 

....do 


On  guide  clips 

Right  sighting  platform . 

do 

Left  sighting  platform. . . 
Right  sighting  platform . 
Left  sighting  platform... 

do 

Right  sighting  platform . 

On  top  carriage 

do 


Traversmg  gear 

....do 

Elevating  band  (H16J1) 

Elevating  band  (H16Q1) ... . 

On  concrete  platform 

On  traversing  rollers 

Interior  of  piston  rod  (9BA), 

Outer  dust  guard , 

In  front  transom 

....do 


Bolts,  special. 
do 


Bolts,  special  tap 

Bolts,  special  with  nuts. 

Bolt,  special  with  nut.. . 

Bolts,  tap 

do 

do 

do 

do 

do 

do 

do 

do 

do 


In  axle  caps  (H6L)  (H6M) . 

In  cap  squares  (8K)  (8L) . . . . 

In    lower    cylinder    head 

through  counterweight. 

In  sight  standard 

....do 


do. 

do- 

do. 

do. 

do. 

do. 

do. 

do. 

do. 

do. 

do. 

do. 

do. 

do. 


do.... 

do.... 
do.... 


In  traversing  stops 

In  bearings  (H4C1) 

Inner  and  outer  dust  guard. . 

Outer  dust  guard 

Inricht  chassis 

In  left  chassis 

In  piston-rod  bracket 

In  guides 

In  elevating  screw  support. . 
In  front  clips  and  rear  tran- 


In  rear  transom 

In  elevating  gibs 

In  front  transon 

In  angles  (7A1) 

In  bottom  plate  gibs 

In  guide  cUps 

In  keys  (7M) 

In  gun  lever  yoke 

In  cylinder  head  (9Q) 

In  recoil  cylinder  (9G) 

In  oil  gutter  (9U) 

In  recoil  pointers 

In    rope    clamps    (H12F) 

(H12G). 
Rear   clip    and   traversing 

bracket. 

In  pointer  base  (llQl) 

In  trough  brackets 

In  upper  traversing  bearing. 


S 
S 
S 
S 

s 
s 
s 
s 

CSNo. 
CSNo. 

s 

s 

FSNo. 
FSNo. 
CI  No. 
BzNo. 
BzNo. 

S 

S 

s 
s 
s 

S 


3  by  3.5  by  0.3125. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 


0.5  by  1.375. 
1.25  by  9.625. 
1.25  by  12.875. 

1.5  by  6.5. 
1.125  by  5. 

1.5  by  10.0625. 
2  by  8.375. 

0.5  by  1.875. 
0.375  by  0.75. 
0.5  by  0.75. 
1.25  by  3. 

Do. 
0.75  by  2. 
1  by  6.75. 
0.75  by  1.5. 
\  1.25  by  3. 

1.25  by  6.25. 
1  by  2.5. 
i  1.25  by  3.25. 
0.75  by  1.25. 

Do. 

Do. 
1  by  1.75. 
1.5  by  3. 
1  by  2.5. 
0.75  special. 
0.375  by  0.75. 
0.75  by  2. 
0.5  by  1.5. 

1.25  by  3. 


0.75  by  1.75. 


40 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

6-lNCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mil— Continued. 


Piece 
mark. 


16Q 
17AA 
18V 
19A 
19G 
19J 
9V 
20D 
25B 
25C 
25E 

26C 
7J 

7K 
7L 

7V1 

H4P 

H4Q 

H15B 

H15P 

H15M 

6M 

6P1 

68 

6W 

8J 

H16M 

H16N 

H13F 

13E 

13G 
13V 
13Z 

H18R 

H18S 

16C 

16E 
16F 
16G 
16N 

16R 

17T 

17W 

19K 

19R 

19W 

19X 

20G 

20P 

20Q 

20V 

20DA 

20FA 

20GA 

20HA 

20JA 

20MA 

20A 

20BA 

20L 

20M 

18HA 

18EA1 

18J 

18H 

16V 

16M 
16J 
16B 

N18N 


Num- 
ber 


Name  of  part. 


Bolts,  tap. 
do 

do 

do 

do 

do 

....do 

....do 

....do 

do 


.do. 


....do 

Bottom  plate. 
Bottom  plate  i 
do 


Bottom  plate  liners . 
Bolts,  with  nuts — 


.do. 


....do 

....do 

do 

....do 

....do 

....do 

....do 

....do 

....do 

....do 

....do 


Bolts,  with  nuts,  counter- 
sunk. 

do 

Bolts,  with  nuts 

....do 


...do 

...do 

...do 


do 

do 

do 

do 


.do. 


Bolt,  with  crown  nut. 

Bolts,  with  nuts 

do 

do 


....do 

....do 

....do 

....do 

....do 


....do 

do 

....do 

....do 


....do 

....do 

....do 


Braces,  comer. 

do 

Brace  feet 

Brace  pins 

Bushings 

do 

do 

do 

do 


...do 

...do 


Location. 


In  lower  traversing  bearing. 

In  shoulder  brackets , 

In  tripping  lever  stop 

In  sight  arm  bracket  (19D). 

In  guide  brackets 

In  racer  plates 

In  guide  brackets 

In  sighting  platform  frame . 
In  spring  retainer  bracket . . 
-do. 


In    spiral    spring    retainer 
(25D). 

In  retracting  drums 

Under  counterweight 

On  bottom  plate  (7J) 

do 


....do 

Distance  ring. 
do 


In  chassis 

In  piston  rod  bracket 

In  piston  rod  beam 

In  rear  transom 

In  front  transom , 

In  rear  transom 

In  front  transom , 

In  gun  levers 

Elevating  band  (H16Q1) . . . . 

Elevating  band  (H16J1) 

Rear   clip    and    traversing 

bracket. 
In  rope  trough 


do 

Retracting  shipper 

Retracting    crank    shaft 

bracket. 

In  elevating  gear  cover 

do 

Traversing  hand  wheel  shaft 

gear  cover. 
Traversing  clutch  gear  cover 

do 

.do. 


Traversing  crank  shaft  gear 

cover. 
In  lower  traversing  bearing. 

In  shoulder  brackets 

In  firing  pistol  bracket 

In  guide  brackets 

do 

do 

In  sight  standard  (19L1) ... 

Subcaliber  platform 

In  post  feet  (20N) 

do 

In  ladder  sides  (20W)  (20X) 
In  sighting  platform  floor... 

In  ladder  brace  (20E  A) 

.do. 


In  platform  brackets 

do... 

In  sisihting  platform 

Sighting  platform 

do 

Subcaliber  platform 

In  brace  feet  (20L) 

In  tripping  lever  latches 

In  locking  levers  ( 18C A2) .... 

In  pawls  (18K1) 

In  pawl  levers  (18R2)  (18Q2). 
In  upper  traversing  bearing. . 

In  lower  traversing  bearing.. 
In  upper  traversing  bearing . 
U])per  traversing  bearing 
In  traversing  clutch  gear . 


Material. 


S 
S 
S 
S 
S 
S 
S 
S 
S 

S 
CS  No.  1 
Bz  No.  4 
BzNo.4 


Bz 


No.  4 

S 


FS 
FS 
Bz 
Bz 
Bz 
Bz 
Bz 

Bz 
Bz 

[  BzNo.2 


Remarks. 


0.75  by  2.5. 
0.375  by  1.125. 
0.75  by  1.25. 
0.75  by  2.125. 
1  by  3.5, 
0.5  by  1. 
1  by  14.125. 
0.75  by  1.25. 
0.375  by  1.125. 
0.5  by  1.25. 
0.5  by  2.25. 


With  oil  grooves. 
Without    o  i 
grooves. 

0.875  by  3.625. 
0.875  by  2.625. 
1.25  by  5.375. 
0.75  by  3.875. 
1.25  by  4.875. 
1.25  by  7.625. 
1.25  by  11.125. 
1.25  by  9.875. 
1.25  by  7.875. 
1.5  by  6.375. 
1.75  by  11.75. 
1.75  by  13.875. 
1.25  by  4.125. 

0.75  by  1.375. 


0.75  by  3.8125. 

0.5  by  1.375. 
0.5  by  4.125. 
0.5  by  3. 

0.5  by  1.5. 
0.5  by  2. 
0.5  by  6.625. 
0.5  by  2.125. 

0.75  by  3.75. 
0.75  by  7.125. 
0.625  by  2.125. 
1.5  by  13.75. 
1.5  by  10.5. 
1  by  10. 
0.75  by  3. 
0.625  by  1.625. 
0.625  by  1.875. 
0.625  by  2.25. 
0.75  by  1.625. 
0.625  by  2.25. 
0.75  by  1.875. 
0.75  by  2.125. 
1.25  by  10.75. 
1.25  by  10.25. 
0.5  by  1.375. 

On  right  side. 


1.25   inside   dij,rii 
eter. 


1  inside  diameter. 


41 


Names  of  parts  of  6-inch  disappearing  carriage,  L.F.,  model  of  1905  Mil,  their  piece  marks, 
location,  andmat£rial  of  which  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF   1905  Mil— Continued . 


Piece 
mark. 

Num- 
ber. 

Name  of  part. 

Location. 

Material. 

Remarks. 

13R 

2 
2 

1 
2 
2 
2 
1 
2 
1 
2 
2 
36 
36 

1 
2 

10 

6 

1 

1 

2 
2 

2 

1 

1 

6 

1 
2 

2 

S 

Bz 

Bz 

Bz 

Bz 

Bz 
BZNo.4 

Bz 
BZ  No.  4 
BZ  No.  3 
BZ  No.  3 

Bz 

Bz 
BZ  No.  2 

Bz 

Bz 

Bz 

Bz 
BZ  No.  3 
BZ  No.  3 
FSNo.3 
CS  No.  2 
CS  No.  2 
CI  No.  2 
CI  No.  2 

s 

s 

FS 

FS 

FS 
S 

FS 
FS 

S 

s 
s 
s 

Bz 
Bz 

S 
Bz 

S 

S 

Bz 
Bz 
Bz 

S 

s 
s 

Bz 

Bz 

S 

Bz 
Bz 

Bz 
CI 

CI 

CI 

CI 

CI 

s 

FS 
FS 

12\A 

do 

In  clutch  sleeve 

do       .              

Elevation  disk  gear 

H13H 

..     .do 

In  upper  guide  sheave 

In  lower  guide  sheaves 

H13G 

.do 

H16G 

do 

9GA 
H12E 

do 

do 

In  lower  cylinder  head  (9V).. 
In  elevating  slide 

9P 

do 

In  upper  cvlinder  head  (9Q) . 
In  upper  end  of  gun  levers. . . 
In  lower  end  of  gim  lever — 
In  rollers  (HeF) 

8G 

.do 

In  halves. 

8A 

do   .  .           

H6C 

do 

H6B 

do 

In  rollers  (H6D)     

6L 

do       .              

In  transom  cap  (6K) 

In  elevating  screw  support.. 

6C 
5A 

do 

.do       

4G 

do 

In  right  chassis 

4F 

.do 

.do 

H6S 

Right,  in  halves. 
Left  in  halves. 

H6T 

do 

.do 

H6W1 

On  front  of  top  carriage 

On  upper  end  of  gun  lever... 

8K 

Cap  square 

Right. 

8L 

.do 

Left. 

5C3 

Chassis,  left 

4A 

Chassis,  right 

.do 

H4E 

Hold    section    to- 

IIBA 

Clamping  screw 

In  pointer  base                 .... 

gether. 

Clevises .                     

For  rope  of  counterbalance 
device. 

In  guide  clips 

Attaching  rope  to 
equalizmg  bar 
(H13N). 

Long. 

Short. 

7R 

Clip  bolts,   with  special 
nuts, 
do       .           

7S 

do                  

17N 

Clutch  fork 

OnT)inQ6L')          -          

Attached  to  clutch 

17L 

Clutch  rod .     . 

Attached  to  lever  (17 J) 

On  clutch  rod  (17L) 

rod. 

17M 

Clutch  rod  end: 

12Z1 

Clutch  sleeve       

Retracting  drum  shaft 

Lower  guide  sheave  axle 

On  intermediate  stud  (IIF) . 
On  stud  (UG)       

H13L 

Collars 

HE 

do       

IIH 

do 

UN 

.do 

llU 

do 

do 

(Jo                    

llDA 

12L 

.do 

Retracting       intermediate 
shaft. 

Retracting  drum  shaft 

(Jo                        

12M 

.do 

12W 

do      

12X 

do 

do      

12CA 

.do 

Retractmg  crank  shaft 

do 

12DA 

do 

13B 

.do 

13RA 

do 

On  retracting  brake  lever 

stud. 
On  traversing  crank  shaft . . . 
do   

14A 

.do    : 

14C 

do 

Provided  with  felt 

14M 

do      

On  traversing  intermediate 

shaft. 
Onpin(16L)             

washers. 

16  P 

do 

do      

18Z 

On  shaft  (18X)                ..     . 

12J 

Collar,  inner 

Retracting        intermediate 
shaft, 
do   

12K 

Collars,  outer 

7D 

Coimterweight   pieces   of 

eighth  layer. 
Counterweight  pieces, 

side,  of  seventh  layer. 
Counterweight  inside 

piece  of  seventh  layer. 
Counterweight  special 

layer. 
Counterweights,    first    to 

sixth  layers,  inclusive. 

7E 

do    

7F 

do 

7G 

do                          

Used  with  model 

7H 

do       -               

1908  gun. 

11L2 

12GA 

Crank  hooks 

In  chassis .       .               . 

For  cranks   when 

12HA 

Crank  handle  hooks 

do 

not  in  use. 

42 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mii,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mn— Continued. 


Piece 
mark. 


Num- 
ber. 


Name  of  part. 


Location. 


Material. 


Remarks. 


20T 
7C 
7V 

7AA1 

7Q 


14F 

14L 

14P 
14T 

lis 

6V 
9V 

9Q 

H4A2 

H23W 

H23Z 

H23BA 

H23CA 
H23S 

H23T 

H23V 

9T1 

16U 

H4D 

H16F 

H16J1 

H16Q1 

11A2 

11D3 

H18T 

H18X 

6F 

6G 

IIZ 

H16E 

H12A 

6B 

IIY 

H18E 

H18F 

H12D1 

H12H 

H12J 

H12N1 

20R 

H13N 

H13D1 

H13P 

H13A 

8M 

H6Q 


9F 

17X 

H4H 

17D 


Crosshead 

Crosshead  gibs . 

do 


Crosshead  liners. 
Crown  nuts 


.do. 
.do. 
-do. 


....do 

....do 

....do 

....do 

....do 

Cylinder  head,  lower. 

Cylinder  head,  upper. 


Distance  ring 

Direction  plates 

do 

Direction    plates,    filling 
plug. 

do 

Direction  plate,  retracting . 

....do 


Direction  plate,  traversing. 

Drain  plug 

....do 


Dust  guard,  outer. 
Elevating  arm 


Elevating  band 

do 

Elevation  disk  gear 

Elevation  disk 

Elevating-gear  cover 

do 

Elevating  gib,  right 

Elevating  gib,  left 

Elevating,       handwhecl, 
commercial. 

Elevating  pin 

Elevating  screw 

Elevating-screw  support. 

Elevating  shaft 

Elevating-shaft  gear 

Elevating-shaft  pinion . . . 

Elevating  slide 

Elevating-slide  nut 

Elevating-slide  spring 

Elevating-slide  stop 

Elbows 

Equalizing  bar 

Equalizing-bar  fork 

Equalizing-bar  pin 

Eyebolts 

do 

do 

Filler  pieces 

do 

Filling  plugs 

Firing  pistol  bracket 

Fish  plates 

Foot  piece 


6E 


2     Front  clips. 


Sighting-platform  railing 

Above  coimterweight 

In  guide  clips  rear  surface, 

interior. 
In  guide  clips  front  surface, 

interior. 

In  guide  clips 

On  sight  arm  bracket  pins 

(19C). 
On  retracting  brake  lever 

stud. 
On    traversing    handwheel 

shaft. 
On  traversing  intermediate 

shaft. 


On  traversing  pinion  shaft. . 

On  elevating  shaft 

On  suspension  rods  (7U)  — 

On  studs  (6H) 

Lower  end  of  recoil  cylinder 

(9G). 
Upper  end  of  recoil  cylinder 

(9G). 
Between  racer  and  base  rmg 

On  elevating  handwheel 

....do 

On  buffer  cylinders 


On  crosshead 

Retracting      crank      shaft 

bracket. 

do..: 

On  right  chassis 

In  lower  cylinder  head  (9V). . 
In   traversing   crank   shaft 

gear  cover. 
Attached  to  base  ring  outside 

roller  path. 
Between  elevating  slide  and 

band. 

On  gun 

do 

On  stud  (IIG) 

On  elevation  disk  gear 

Over  elevating-shaft  gears. . . 

do 

In  rear  transom 

do 

On  elevating  shaft 


Elevating  arm 

In  rear  transom 

Bottom  of  rear  transom 

In  left  chassis 

On  elevating  screw 

On  elevating  shaft 

In  rear  transom 

In  elevating  slide 

On  elevating-slide  nut 

On  rear  transom 

Platform  railings 

On  equalizing-bar  fork 

In  weight  (H13E) 

In  equalizing  bar 

In  weight  (H13E) 

In  cap  squares  (8L)  (8K). . . 
In  axle  caps  (HBL)  (H6M). . 

Subcaliber  platform 

Sighting  platform 

In  upper  cylinder  head  (9  Q) 
On  upper  traversing  bearing 
Outer  dust  guard  (H4D) . . . 
Onshank(l7E) 


On  racer  over  lips  of  base 
ring. 


MI 

CS  No.  1 
BZ  No.  4 

BZNo.4 

BZ  No.  4 

S 


S 

s 
s 
s 
s 

FSNo.3 

S 

CS 
Bz 
Bz 
Bz 

Bz 
Bz 

Bz 
Bz 

FSNo.3 
Bz 


CS  No.  2 

CSNo.1 
CS  No.  1 

CI 

GS 

CI 

CI 

s 
s 

CI  and 

WI 

FSNo.3 

FSNo.3 

CS 

FS 

CI  No.  1 

FSNo.2 

CS  No.  2 

BZNo.4 

S 

FS 
MI 
S 

FS 
FS 
S 

s 
s 

s 
s 

Bz 
Bz 
S 
Bz 

CS  No.  2 


0.735  thick. 
0.485  thick. 


In  4  sections. 
Depress. 
Elevate. 

Ciu-ved  for  surface 
of  cylinder. 

Right. 

Left. 


In  4  sections. 


For  gun  model  1905. 
For  gun  model  1908. 

Range  scale. 
Upper  half. 
Lower  half. 


Spokes  cast  in  hub. 


0.1875  thick. 
0.3125  thick. 
1  extra. 


Part     of      clutch 
plunger. 


43 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mn— Continued. 


Piece 

Num- 

mark. 

ber. 

17B 

1 

20K 

2 

2 

18 

H6A1 

36 

9M 

1 

9N 

1 

19T 

1 

19S 

1 

7P1 

1 

7N1 

1 

H15N2 

1 

H15L2 

1 

H13K 

2 

HI  3  J 

2 

H13S 

1 

H13T 

1 

H15H1 

1 

H15J1 

1 

8H 

1 

8Q 

1 

8P 

1 

7Z 

2 

ST 

1 

9DA 

1 

9Y 

1 

13EA 

2 

13C 

2 

llBl 

1 

lie 

1 

IIF 

1 

2 

2 

HloQ 

2 

7M 

2 

1 

3 

1 

2 

2 

2 

2 

14V 

1 

2 

1 

2 

18Y 

2 

1 

12H 

1 

12P 

2 

12Q 

1 

12T 

1 

12V 

1 

20EA 

2 

20X 

2 

20W 

2 

20U 

8 

17G1 

1 

17BA 

1 

18LA 

2 

18W 

1 

17.T 

1 

H3E 

12 

9L 

1 

Name  of  part. 


Fulcnim . 


Fulcrum  pins . 
Gaskets 


do :.. 

Gasket 

Gears 

Gland 

do 

Guide  bracket,  left . . . 
Guide  bracket,  right . 

Guide  clip,  left 

Guide  clip,  right 

Guide  frame 

....do 

Guide  sheaves,  lower. 


Guide  sheaves,  upi)er 

Guide  sheave  axle,  lower. 

Guide  sheave  axle,  upper. 

Guide,  vertical 

do 

Gun  lever  axle 

Gun  lever,  left 

Gun  lever,  right 

Gtm  lever  pins 

Gim  lever  yoke 

Hasp 

Hasp  bracket 

Idler  sheaves 

Idler  sheave  pins 

Intermediate  gear 

Intermediate  pinion 

Intermediate  stud 

Keys 

do 

do 

do 

do 

do 

do.: 


.do. 
.do. 

.do. 
-do. 
.do. 
.do. 
.do. 

.do. 


....do 

....do 

Key,  square  gib. 


....do 

....do 

....do 

-...do 

Ladder  braces 

Ladder  sides,  left. . . 
Ladder  sides,  right. 
Ladder  steps 


Latch 

Latch  pedal.. 

Latch  springs . 

I^  ver 


Leveling  screws . 
Liner 


Location. 


Underneath    left    sighting 

platform. 
In  platform  fulcrums  (20H) 

(20J). 
Under  upper  cylinder  head 

(9Q). 

On  bolts  (9J) 

On  lower  cylinder  head  (9V) 

On  rollers  (H6D) 

In  upper  cylinder  head  (9Q) 
In  lower  cylinder  head  (9V). 

On  left  chassis 

On  right  chassis 

On  crosshead 

do 


Under  chassis 

do 

Rear   clip    and    traversing 

bracket. 

Rear  transom 

Rear   clip    and    traversing 

bracket. 

Rear  transom 

On  chassis  and  guide  frame. 

do 

On  top  carriage 

On  gun  lever  axle 

do 

In  crosshead 

Between  gun  levers 

On  hasp  bracket  (9Y) 

On  piston  rod  bracket 

In  rope  sheave  brackets 

do 

On  stud  (IIF) 

do 

In  left  chassis 

In  right  chassis 

In  left  chassis 

In  chassis  and  guide  frame. 

On  crosshead  (7C) 

Elevating  screw 

Elevating  shaft 

Retracting       intermediate 

shaft. 
Retracting  drum  shaft . .  ^ . . 
do 


In  rope  sheave  pins  (13A) 
In  traversing  shaft  pinion . . . 

In  traversing  crank  shaft 

do 

In    traversing    handwheel 

shaft. 
In  traversing   intermediate 

shaft. 

In  shaft  (18X) 

do 

Retracting        intermediate 

shaft. 

Retracting  drum  shaft 

....do 

Retracting  crank  shaft 

do 

For  ladder  sides  (20W)  (20X) 

Sighting  platform 

do 

Between  ladder  sides  (20W) 

(20X). 

In  spring  stirrup  (17F) 

On  latch  (17G1) 


In  spring  bracket   (18MA) 
(18NA). 

On  shaft  (18X) 

In  fulcrum  (17N ). 

In  base  ring 

In  lower  cylinder  head  (9V). 


Material. 


Bz 

FS 


C 

C 
FS  No.  3 
BZNo.4 
BZNo.4 
CSNo.2 
CS  No.  2 
FSNo.3 
FS  No.  3 
CI  No.  2 
CI  No.  2 
CI  No.  1 

CI  No.  1 

FS 

FS 
FSNo.2 
FSNo.2 
CS  No.  3 
CS  No.  2 
CS  No.  2 
FSNo.2 
CS  No.  2 

S 

Bz 

CI 

FS 

CI 

Bz 


FS  No.  3 
FS  No.  2 

S 


FS  No.  3 

S 

S 

s 
s 
s 
s 

s 

s 
s 


FSNo.3 
FSNo.3 

S 

s 
s 
s 
s 
s 


SpS 

FS 

S 

S 

BZ  No.  4 


Remarks. 


Riveted  in. 


Right. 
Left. 


Right. 
Left. 


0.5  square,  staked 

in. 
Riveted  in. 
0.5  square,  staked 

in. 
Staked  in. 


Riveted  in. 
0.5  square. 


Staked  in. 


6.5  long. 
3.625  long. 


For     operating 
latch. 


For  tripping. 


44 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mii,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL   OF  1905  Mu— Continued. 


Piece 
mark. 


9W 
H12C 
H12B 

18S 

9CA 

18CA2 

18BA1 
18B 

18L 

18M 

18AA1 

9R 
13GA 

9B 

9C 

H12M 

H13C1 

H6X 
17R 


H6V 
9U 


Q3C 
Q3B 


18K1 

18G 

18R2 

18Q2 

20CA 

17K 

17H 

17C 

16L 

13MA 
13  KA 
13FA 
13CA 
13Y 


H16K 


Num- 
ber. 


125 

17 

1 


Name  of  part. 


Liners 

Liner,  left 

Liner,  right 

Link  pins 

Locking  disk. . 
Locking  levers. 


Locking  lever  pins . 
Locking  links 


Locking  link  pins . 
do 


Locking  lever  pin  collars . 


Lock  screw 

Loops 

Name  plate  No.  1 , 

Nut 

do 

do 

do 

do 

do 

do.. 

do 

do 

do 

Oil  gutter 


Oil  plugs,  0.375  standard . 
Oil  plugs,  0.25  standard . . 
Padlock,  Yale,  standard. 

No.  853. 
Pawls 


Pawl  fulcrums . 
Pawl  lever,  left. 


Pawl  lever,  right. 


Packing  rings . . . 
Pinch-bar  hooks. 

Pins 

do 

....do 

do 

do 


Location. 


On  piston  and  rod  (9B  A) 

Elevating  slide 

do... 

In  tripping  links  (18P) 

On  top  of  piston  rod  (9BA). 
On     locking     lever     pins 

(18BA1). 

In  chassis 

Buffer    Yokes    (H7BA1) 

(n7CAl). 

In  locking  links  (18B) 

do 

On     locking     lever     pins 

(18BA1). 

In  piston  and  rod  (9B  A) 

On  retracting  rope 

On  top  carriage 

On  piston  rod 

.....do 

Elevating  slide  stop 

EquaUzing  bar  fork 

On  safety  latch  pin  (18A) . . . 
On  buffer  rod  cups  (HeWl). 

On  roll  pins  (17Q) 

On  pawl  fulcrums  (18G) 

On  locking  lever  pins  (18BA1) 
On  roller  axles  (H6K1). . . 
On  piston  rod  beam 


For  carriage 

do 

On  hasp  bracket . 


Material 


On  pawl  fulcrums  (18G). 

In  chassis 

On  pawl  fulcrum  (18G).. 


.do. 


In  recoil  cylinder  (9G) 

On  side  of  sighting  platform . 

In  bushings  (18HA) 

In  bushings  (18EA) 

In  bushings  (18.T) 

In  bushings  (18H) 

In  lever  (17 J)   and  clutch 

rod  (17L). 

In  latch  (17G1) 

In  fulcrum  (17B) 

In  bushings  a6B)  (16V) 

In  bushing  (161) 

In  bushing  (16M) 

In  lower  traversing  bearing. . 

In  bushings  (H18N) 

In  retracting  rope 

In  shipper  handle 

In  retracting  shipper 

In  retracting  brake  lever 

In  retracting  shipper 

Retracting  drum  shaft  gear. . 

In  bushings  (12A) 

In  strips  on  pointer  (llPl) . . 

In  pointer  (11  PI) 

Instud(llG) 

In  elevation  disk  gear  and 

chassis. 
In  intermediate  gear  (llBl). 
For  rope  of  counterbalance 

device. 
In  bushings  (H13G)  (H13H). 

In  bushing  (m6G) 

Elevating  band 

Rope  clamps  (m2F)  (H12G) 

Elevating  slide  stop 

In  bushings  (H12E) 


BZ  No.  4 
BZNo.  2 
BZ  No.  2 
BZ  No.  3 

Bz 
FSNo. 

FSNo. 

S 

Bz 
Bz 


S 

FS 
Bz 
FSNo.  3 
FS  No.  3 
S 
S 

s 

S 

s 
s 
s 
s 

Bi 

Bz 

Bz 

Comm 

FSNo.  A 

FS  No.  3 
[FSNo.  2 
i  or 
|CSN0.2 
(FSNo.  2 
{  or 
CSNo.2 
GWHP 

FS 

Bz 

Bz 

Bz 

Bz 

Bz 

Bz 
Bz 
Bz 
Bz 
Bz 
FSNo.  3 
Bz 

S 

S 

s 
s 
s 
s 

Bz 
GS 
Bz 


S 
S 

Bz 
Bz 

S 


Bz 


Remarks. 


Connecting    yokes 
to  locking  lever. 

1.8125  long. 
0.5  by  0.75. 


For    oil    in    recoil 

cylinder. 
Including  extras. 

Do. 
For  recoil  valve. 


For  racks  on' 
head. 


extra. 


0.5  by  4. 


For   spiral   spring 
(IIM). 


45 

Names  of 'parts  of  6-inch  disappearing  carriage^  L.  F.,  model  of  1905  Mil,  their  piece  marls, 
location,  ana  material  of  ichich  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905-Mn— Continued. 


Piece     Num- 
mark.      ber. 


Name  of  part. 


Location. 


Material. 


Remarks. 


4C 

llJl 

9BA 

H15C 

H15G 

H14G 

20PA 

20NA 

20Z 

20LA1 

20KA1 

20C2 

20B 

20J 

20H 

20F 

20E 

20Y 

18QA 

18F2 
18PA 
IIP! 

IIQI 
20N 

9E 

H14A 

H14B 

19F 

19H 

19P 

4E 

H6H1 

4D 

H6G1 

H6E 

4B 


H13M1 

9G 

lOFl 

lOG 

13PA 

13SA 

iSTA 

13QA 

13NA 
12R1 

12S 
12G 

12FA 
.     12JA 

12EA 


Pins. . 
....do. 
....do. 
....do. 


.do- 
.do- 
.do. 
-do. 
.do. 
.do. 
.do. 
.do. 


Pinion 

Piston  and  rod 

Piston  rod  beam 

Piston-rod  bracket 

Plates 

....do 

....do 

Platform  braces 

Platform  bracket,  left . . . 
Platform  bracket,  right. 

Platform  floor,  left 

Platform  floor,  right 

Platform  fulcrum,  left. . . 
Platform  fulcrum,  right . 

Platform  frame 

Platform  plate 

Platform  supports 


Plugs 

Plungers 

Plunger  springs . 
Pointer 


Pointer  base . 
Post  feet 


Plug 

Racer 

Racer  liner 

Racer  cover  plates . .  . . 

Racer  plate,  right 

Racer  plate,  left 

Racks,  left 

....do 

Racks,  right 

do 

Rack  retaining  screws. 

do 

Railing  pieces.. 


Railing  posts 

Rear  clip  and  traversing 
bracket. 

Recoil  cylinder 

Recoil  pointers 

Recoil  scales 

Retracting  brake  lever  — 

Retracting    brake    lever 

stud. 
Retracting    brake    lever 

stop. 
Retracting  brake  strap  — 

Retracting  brake  wheel 

Retracting  clutch 

Retracting  clutch  spring. . . 

Retracting  crank  shaft 
pinion. 

Retracting  cranks 

Retracting  crank  fasten- 
ings. 

Retracting  crank  shaft 


Inbody  (9EA) 

Inplug(9E) 

In  bushings  (H6C) 

For  rack  retaining  screws 

(H6E). 

In  gears  (H6A1) 

In  clip  bolts  (7R),  (7S) 

In  bushing  (6L) 

In  bushing  (60) 

For  bushing  (5A) 

For  bushing  (4G) 

For  bushing  (4F) 

For  rack  retaining  screws 

(4B). 

On  elevating  shaft ^ . . . 

In  recoil  cylinder  (9G) 

Between  guide  frames 

On  front  transom 

In  racer 

Sighting  platform 

do 

Subcaliber  platform 

On  left  chassis 

On  right  chassis 

Sighting  platform 

do 

SubcaUber  platform 

do 

....do 

....do 

Sighting  platform 


In  plungers  (18F2) 

In  pawl  levers  (18Q2),  (18R2). 

On  plungers  (18F2) 

In  pointer  base 


On  left  chassis .• 

Sighting  and  subcaliber  plat- 
forms. 

In  upper  cylinder  head  (9Q). 

On  traversing  rollers 

On  racer 

do 

do... 

do 

On  chassis 

On  top  carriage 

On  chassis 

On  top  carriage 

In  top  carriage 

In  chassis 

Sighting  and  subcaliber  plat- 
forms. 

do, 

On  racer 


In  counterweight 

On  chassis 

On  guide  clips 

On  retracting  brake  lever 

stud. 
In  left  chassis 


.do. 


Bz 

S 
S 


S 

s 

Bz 
Bz 
Bz 
Bz 
Bz 
S 

s 

FSNo.3 
CS  No.  2 

CS 

CI 


CS 
CS 

s 
s 

FS 
FS 

s 
s 


Bz 

S 

Bz 

CS  or  FS 

S 

CI  No.  2 

Bz 

S 
S 

s 

FS  No.  3 
FS  No.  3 
FS  No.  3 
FSNo.3 

S 

S 
WI 

WI 

CS  No.  1 

FS  No.  3 
Bz 
Bz 
FS 


Riveted. 


On  retracting  brake  lever . 

On  retracting  drum  shaft — i  CI  No.  2 
Retracting  drum  shaft j  CS  No.  1 


do. 
Retracting  cranks. 

In  chassis . 


SpS 


FS 


ps 
No. 


FS 
S 


FSNo.3 


Leaded  in. 
Left  side. 

Do. 
Complete. 


0.25  plate. 
Do. 


Complete. 
0.125  plate. 
For  subcaliber 
platform. 


For  elevation  and 
range  scale. 


In  4  sections. 

0.375  plate. 
Do. 


Around  retracting 
brake  wheel. 


Complete    chain 
and  pin. 


46 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mii,  their  piece  marhSy 
location,  and  material  of  which  they  are  made — Continued. 

6-INCH   DISAPPEARING  CARRIAGE,  MODEL   OF   1905  Mil— Continued. 


Piece 
mark. 


13AA 

12U 

26A 

12Y 

26B 

12N 

12F 

12B 

13L 
13H 
13K 
13BA 
13X 

13JA 
13U 


H6D 
H6F 
17P 
H6K1 
H23B 
H23C 
H23E 
H23D 

H23H 

H23J 

H6N 

H6P 

17Q 

H13R 

13HA1 

26D 

H12G 

H12F 

13M 

13N 

13DA 

13A 

H13Q 

13P 

13Q 

18C 

7W 

18A 

llAAl 

IICA 

H23U 

19B 

17CA 


Num 
ber. 


2 
118 


Name  of  part. 


Retracting    crank     shaft 

brackets. 
Retracting  drum  shaft . . . 
Retracting  drum.,  right. . . 

Retracting    drum,    right 

gear. 
Retracting  drum,  left 


Retracting     intermediate 

shaft. 
Retracting     intermediate 

shaft  gear. 
Retracting    intermediate 

shaft  pinion. 

Retracting  pawl 

Retracting  pawl  lever 

Retracting  pawl  shaft 

Retracting  ratchet 

Retracting  shipper 


Retracting  shipper  rod . . . . 
Retracting  shipper  swivel, 

Rivets 

do 

do 

do 


.do. 

.do. 
.do. 

.do. 
.do. 
.do. 
.do. 


do 

do 

Rivets,  countersunk . 

do 

do 

do 

Rollers 

do 

do... 

Roller  axles 

Roller  bearings 

do 

do 

....do 


.do. 
-do. 


Roller  cage  side  frames. 

do 

Roller  pins 

Rope 

Ropes 

Rope  clamps 

Rope  clamp,  left 

Rope  clamp,  right 

Rope  sheave  bracket . . 

do 

Rope  sheaves 

Rope  sheave  pins 

Rope  socket  pins 

Rope  trough 

do 

Safety  latch 

Safety  latch  dog 

Safety  latch  pin 

Screws 

do 

Screws,  countersimk . . 

do 

do 


Location. 


On  chassis . 


In  chassis 

On  retracting  drum  shaft 

Retracting  drum  shaft 


On  retracting  drum  shaft — |  CI  No.  2 
In  chassis FS  No.  3 


Material. 


CI 


rSNo.3 
CI  No.  2 


CI  No.  2 


On  retracting  intermediate 

shaft. 
do 


On  retracting  pawl  shaft 

do 

In  right  chassis 

On  retracting  crank  shaft 

Attached  to  rear  transom.... 


On  retracting  shipper 

Retracting  shipper 

In  retracting  drum  shaft 

In  brake  lever  strap 

In  traversing  crank  shaft 

In  fulcrum  (17B)  and  spring 

stirrup. 
In  spring  brackets  (18MA), 

(18NA). 

In  plungers  (18F2) 

SubcaUber     and     sighting 

platforms. 
In  ladder  sides  (20W),  (20X) . 

Sighting  platforms 

In  railing  post  feet 

In      subcaliber      platform 

braces. 

In  bottom  plate  liners 

Outer  dust  guard * . . . 

In  liners  (9W) 

Inhasp(9DA) 

In  recoil  scales 

In  liners  (H12B),(H12C).... 

Under  top  carriages 

Under  top  carriage 

On  roller  pins  (17Q) 

In  rollers  (M6D),  (H6F) 

Elevating  gear 

Traversing  gear 

do 

Retracting  gear 


.do. 
.do. 


For  roller  imder  top  carriage . 
For  rollers  under  top  carriage 

In  clutch  fork  (17N) 

For  counterbalance  device. . . 

For  retracting 

On  retracting  drum? 

On  elevating  slide 

do 

On  chassis 

do 

In  rope  sheave  brackets 

Rope  sheave  brackets 

In  clevises 

Inside  chassis 

do 

On  safety  latch  pin 

On  guide  clip  (7P1) 

In  left  chassis 

Elevation  disk 

In  pointer  base 

In  direction  plates 

In  racer  cover  plates 

In  latch  pedal  (17BA) 


CI  No.  2 

FS  No.  3 

FS 
FS 
S 

FS 
FS 

FS 
Bz 

S 
g 

s 
s 

Br 

Bz 

S 

S 
S 

s 


Bz 
WI 
Br 

S 

Bz 
Br 

FS  No. 
FSNo. 

Bz 
FSNo. 

S 


S 

s 

s 
s 

FS  No.  2 
FSNo.  2 

S 

s 
s 

FS 

s 
s 

CI 
CI 
CI 

FS 
FS 

s 
s 

cs 
s 

BzNo.3 

GS 
Bz 
Bz 

S 
S 


Remarks. 


Left-hand     groov- 
ing. 


Right-hand  groov- 
ing. 


For    retracting 
clutch. 


For  keys. 
0.375  diameter. 

Do. 

0.125  diameter. 
0.375  diameter. 

Do. 
0.5  diameter. 
0.25  diameter. 

Do. 


0.375. 


For  clutch  fork. 


Without  sleeve  on 
shaft. 

Do. 

Do. 
Inside. 
Outside. 


Right. 
Left. 


Right. 
Left. 

On  left  side. 
For  safety  latch. 
0.25  by  0.75. 
0.375  by  0.718. 
0.25  by  0.625. 
0.5  by  1. 
0.375  by  0.75. 


47 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  marks, 
location,  and  material  of  which  they  are  imade — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mil— Continued. 


Piece 
mark. 


Num- 
ber. 


H16D 
9X 

8S 

8C 

H6R 

7BA 

7X 
H14F 
H14C 


9Z 

H18H 
H16A 

19E 
13W 
18X 
17E 

13LA 

17V 
17U 

17S 

19D 


19L 
19L1 

19C 

14J 
IIX 


Mamc  of  part. 


Location. 


Screws,  countersunk. 

....do 

...-do 

....do 

....do 


....do 

....do 

....do 

....do 

Screw  eyes . 


Screws,  flat-head  cap. 
Screws,  fillister  head . 

.do 


Washers  (H16B),  (H16C)... 

In  hasp  bracket  (9Y) 

In  bushings  (8G). 

In  washers  (8B) 

In  axle  bed  bushings  (H6S), 

(H6T). 
In  safety  latch  dog  (7W) . . . 

In  crosshead  gibs 

In  racer 

In  racer  liner 

Retracting  cranks 


In  name  plate  No.  1 

In  upper  end  of  piston  and 
rod. 

In  traversing  rack 

Set  screws i  In  lower  end  of  elevating 

j      arm. 

— do I  In  sight  standard 

Special  screws I  Retracting  shipper 

Shaft j  Through  chassis 

Shank In  spring  stirrup  (17F) 


Shipper  handle 

Shoulder  bracket,  left . . 
Shoulder  bracket,  right. 
Shoulder  rest 


Sight-arm  bracket. 


Sight  standard On  left  chassis. 

do do 


Through  chassis. 


On  shoulder  rest 

do 

In    traversing    handwheel 

shaft  gear  cover. 
On  sight  standard 


Sight-arm  bracket  pins j  In  sight-arm  bracket  (19D). 


Sleeve Traversing  handwheel  han- 
dle, 
do Elevating  handwheel  handle 


Split  pins . 

do 

....do 

....do 

....do 

.-..do 

.--.do 


do. 

do. 

do. 


.do. 
.do. 
.do. 
.do. 
.do. 

.do. 

.do. 
.do- 
.do. 
-do. 
-do. 


....do 

..-.do 

....do 

..-.do 

..-.do 


.do. 
.do. 
.do. 
.do. 


In  crown  nuts  (6V). 
For  crown  nuts. 

Innut  (9B) 

In  taper  pin — 
Innut(H12M). 
In  taper  pin 


;aper 


Inpin(H16K).. 
In  nuts  on  bolts. 
In  taper  pins 


Innut(H13Cl) 

In  equalizing  bar  pin 

In  rope  socket  pin 

In  taper  pins 

Upper   guide   sheave   axle 

(H13T). 
In  taper  pin 


..--do 

-.-.do 

In  crown  nuts  (US) 

Elevating  shaft 

Retracting  intermediate 
shaift. 

Retracting  crank  shaft 

Retracting  drum  shaft 

In  taper  pins 

do 

..-.do 


Inpin(13Y) 

Inpin(13CA) 

Inpin(13FA) 

In  retracting  shipper  rod . 


Material. 


Bz 
S 

Bz 
Bz 
Bz 

Bz 
Bz 
Bz 
Bz 

S 

Bz 


S 
S 

S 

s 
s 
s 

Bz 

Bz 
Bz 

FS 


CS  No.  1 


cs 

CS 


Bz 

Bz 

S 

s 
s 
s 
s 
s 
s 


Remarks. 


0.375  by  1. 
0.5  bv  1.125. 
0.375  by  0.625. 
0.5  by  1.125. 

0.5  by  1.375. 

Do. 
To  close  oil  holes. 
0.5  by  1. 
Holding   chain    o 

fastenings. 
0.25  by  0.375. 
0.375  by  0.5. 

0.5  by  1. 


0.75  by  2.75. 
For  pivot. 

Part  of  clutch 
plimger. 

On  retracting  ship- 
per rod. 


Not  used  on  car- 
riages after  No. 
21. 

For  carriages  after 
No.  21. 

Not  used  on  car- 
riages after  No. 
21. 


In  suspension  rod. 

In  nut  (90). 

For  elevating  screw. 
For  •  spring    com- 
pressor nut. 

For  elevating  bandt 
For     band     trun- 
nions. 


For  collars  (H13L). 


Rear  clip  and  trav- 
ersing bracket. 
For  collar  (HE). 
For  collar  (IIH). 


For  collars  (13B). 
Idler  sheave  pins. 
Retracting      pawl 
shaft. 


48 

Names  of  parts  of  6-inch  disappeariTig  carriage,  L.  F.,  model  of  1905  Mii,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mil  Continued. 


Piece 

Num- 

mark. 

ber. 

1 

1 

1 

6 

2 

1 

1 

2 

1 

2 

3 

1 

1 

1 

4 

2 

4 

1 

1 

2 

2 

2 

2 

IIM 

25D 

25F 

18NA 

18MA 

18KA 

25A 

17F 

17A 

H12K 

•2 

10 

12 

9EA 

1 

UV 

1 

UK 

1 

13J 

1 

17Z 

2 

3 

H4G 

1 

H4J 

1 

4 

1 

6H 

2 

IIG 

1 

8D 

4 

8E 

4 

8F 

4 

7U 

4 

4J 

2 

5B 

2 

1 

1 

2 

2 

1 

Name  of  part. 


Split  pins . 


Location. 


In  taper  pin. 
do 


In   retracting   break   lever 

stud. 
In  taper  pin 


In  crown  nuts  (14F) 

In  crown  nut  (14L) 

In  taper  pin 

In  crown  nut  (14P) 

In  crown  nuts  (14T) 

In  taper  pin 

In  pin  (170) 

Inpins(17K) 

In  clutch-rod  end  (17M) 

In  taper  pin 

In  crown  nut 

In  locking  link  pins  (18L) 

(18M). 
In  taper  pin 


In  link  pins  (18S) . 

In  taper  pin 

do 

do 


Spiral  spring 

Spiral  spring  retainer 

Spiral  spring  retainer  (for 
gear). 

Spring  bracket,  left 

Spring  bracket,  right 

Spring  plungers 


Spring  retainer  bracket 

Spring  stirrup 

Spring 

Spring  compressing  nut . . . 

Staples 

do 


In  plungers  (18F2) . . 
In  crown  nuts 

In  brace  pins  (20M) . 
In  taper  pin 

do 


Material. 


do. 

Stem.. 
do. 


Stop.. 
Strips. 


do 

do 

do 

do 

do 

Studs 

do 

Studs  with  nuts.. 

do 

do 

Suspension  rods. . 
Taper  dowel  pins . 

do •- 

Taper  pins 

do 

do.... 

do 

do 

do 


Elevation  disk  gear 

On  spring  retainer  bracket . . 
On  elevation  disk  gear 

On  locking  lever  (18CA2).. . . 

do 

In  spring  brackets  (18MA) 
(18NA). 

On  left  chassis 

Under  left  sighting  platform. 

In  spring  stirrup  (17F) 

In  elevating  slide 

For  bottom  plate  (7J) 

For  seventh  and  eighth  lay- 
ers of  weights  (7E)  (7F). 

For  6  large  weights 

In  piston  rod  (9BA) 

Elevating  handwheel  handle 

Traversing  handwheel  han- 
dle. 

In  right  chassis 

On  shoulder  brackets 


In  pointer  (llPl) 

Outer  dust  guard  (H4D) 

Inner  dust  guard 

Outer  dust  guard 

Inner  dust  guard 

In  rear  transom 

In  left  chassis 

In  gun  levers 

do 

....do 

For  counterweight 

In  right  chassis 

In  left  chassis 

Innut(9C) 

In  elevating  screw 

Spring  compressor  nut 

In  band  trunnions 

In  collars  (H13L) 

For  rear  clip  and  traversing 
bracket. 


Bz 

Bz 
Bz 


CS 
Bz 

S 
FSNo.  3 

FS 

FS 

FS 
S 
S 
S 

S 
Bz 

GS 

S 

s 

F 
F 

S 
S 

s 
s 
s 

FSNo.  3 

S 
S 

s 
s 
s 
s 
s 
s 


Remarks. 


For  retracting 

brake  wheel. 
For  collar  (13RA). 


For  traversing 
crank  shaft. 


For  collar  (14M). 
For  collar  (16P). 


For  shoulder  rest. 
For  bolt  (17T). 


For  tripping 
cranks. 

For  lever  (18W). 
For  collar  (18Z). 
For  locking  lever 
pin  collars. 

For  sight  arm 
bracket  pins. 

For   retracting 

drum  (left). 
For  footpiece 

(17D). 


For  carriages  Nos. 
20  and  21. 


With  washer. 


Holding  tube; 

(17Y). 
Pinned  in  place. 
In  4  pieces. 
In  4  sections. 


1.125  by  4.875. 

1.5  by  6.375. 
1.5  by  6.75. 
1.5  by  6. 


49 

Names  of  parts  of  6-inch  disappearing  carrmge,  L.  F.,  model  of  1905  Mn,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mn— Continued. 


Piece 

Num- 

mark. 

ber. 

1 

1 

6 

1 

1 

4 

2 

2 

2 

4 

2 

20S 

9H1 

H3F 

12 

H6U2 

6K 

6RI 

6J1 

14R 

MS 

H18A 

H18B 

H18Q2 

H18P 

H18W1 

16H 

16T 

16S 

16K 

16D 

H18V 

H18U 

14E 

14H 

14N 

14B 

H18G 

14U 

H18J 

1 

H3B 

2 

H3A 

18 

H4B 

24 

18N1 

2 

Name  of  part. 


Location. 


Material. 


Remarks. 


Taper  pins . 

do 

....do 

....do 

-...do 

..-.do 


..--do 

-...do 

....do 

....do 

....do 

do 

.-..do 

....do 

Tees 

Throttling  bars 

Thrust  plates 

Top  carriage 

Transom  cap 

Transom,  front 

Transom,  rear 

Traversing  crank 

TraA-ersing  crank  fasten- 
ing, complete. 

Traversing    crank    shaft 

gear. 
Traversing    crank    shaft 

pinion. 

Traversing  clutch  gear 

Traversing  clutch  pinion. . 


Traversing  clutch 

Traversing     clutch     gear 

cover. 
Traversing    crank    shaft 

gear  cover. 
Traversing  bearing,  lower.. 
Traversing  bearing,  upper. 
Traversing  handwheel 

shaft  gear  cover. 
Traversing  handwheel 

shaft  gear. 
Traversing  handwheel 

shaft  pinion. 
Traversing  handwheel 

shaft. 
Traversing  handwheel 


Traversing    intermediate 
shaft. 

Traversing  crank  shaft 

Traversing  pinion 

Traversing  pinion  shaft . . . 


Traversing  rack 

Traversing  stops 

Traversing  stop  bolt  hole 

plugs. 
Traversing  rollers 


In  collar  (HE) 

In  collar  (IIH) 

Elevating  shaft 

In  pointer  base 

In  collar  (IIDA) 

Retracting  intermediate 
shaft. 

Retracting  crank  shaft 

Retracting  drum  shaft 

In  collars  (13  B) 

In  idler  sheave  pin 

Retracting  pawl  shaft 

In  retracting  brake  wheel 

In  collar  (13R A) 

In  collars  (14C) 


In  collar  (14M) 

In   traversing  crank  shaft 

pinion. 
In    traversing    handwheel 

shaft  pinion. 

In  collar  (16P) 

In  shoulder  rest 

In  foot  piece  (17D) 

In  tripping  cranks  (18N1) . . . 

In  lever  (18W) 

In  collar  (18Z) 

In  locking  lever  pin  collar . . . 

In  retracting  drum  (left) 

Platform  railings 

In  recoil  cylinder  (9G) 

Under  base  ring 

On  chassis 

On  rear  transom 

Between  chassis 

do 

On  traversing  crank  shaft . . . 
Traversing  crank 


On  tra\:ersing  pinion  shaft. 
On  traversing  crank  shaft . . 
do 


On  traversing  intermediate 

shaft. 
On  traversing  crank  shaft . . . 
Over  traversing  clutch  gears. 

Over  traversing  crank  shaft 

gears. 

On  left  chassis 

On  sight  standard 

Over  traversing  handwheel 

shaft  gears. 
On  traversing  intermediate 

shaft. 
On    traversing    handwheel 

shaft. 
In  upper  traversing  bearing. 

On    traversing    handwheel 

shaft. 
In  traversing  bearings 


Tripping  cranks. 


Through  chassis 

On  traversing  pinion  shaft... 
In  rear  clip  and  traversing 
bracket. 

On  base  ring 

do 


In  base  ring 

Between  racer  and  base  ring. 
On  shaft  (18X) 


S 

S 
S 
S 

s 
s 

s 

s 

s 

s 
s 
s 
s 
s 
s 
s 
s 

MI 

FS  No.  2 

S 
CS  No.  2 
CS  No.  1 
CS  No.  1 
CS  No.  1 
FS 

S 


CI  No.  1 

FSNo.2 

S 
FS  No.  2 

BZNo.4 
CI 

CI 

CI 
CI 
CI 

CI  No.  1 

FSNo.2 

FS  No.  1 

Bz 

FSNo.l 

FS  No.  1 
FSNo.2 
FS  No.  1 

S 
S 

s 

FS  No.  3 
FSNo.2 

or 
CSNo.2 


For  traversing- 
crank  shaft. 


Held  in  by  split 
pin. 


Consisting  of  split. 

pin,  chain,  screw 

eye. 
Provided  with  felt 

washer. 


Do. 


In  halves. 
'  Do. 


Do. 


Provided  with|felL 
washer 


Do. 

In  6  sections. 


50 


Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mii,  their  piece  marls, 
location,  and  material  of  which  they  are  made — Continued. 

e-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mn— Continued. 


Piece 
mark. 

Num 
ber. 

Name  of  part. 

Location. 

Material. 

Remarks. 

18T 

1 
2 

1 

1 
1 
2 
1 
2 

2 
12 
14 

1 
1 
1 
1 
1 
1 

1 

1 
1 
1 
1 

1 
1 

1 
1 
1 

1 

1 

1 

5 
3 

3 

2 
6 
2 
4 
2 
4 
4 
1 

Tripping  crank  stop 

Tripping  links 

In  left  chassis 

S 

s 

FSNo.2 
FS  No.  2 

%l 

C 
R 

Br 
Br 

S 

Br 
BZNo.4 

S 

s 
s 
s 

F 
F 

s 

F 
F 
Bz 

S 

Bz 
Bz 
F 
F 

F 

F 
F 
F 

F 
F 

F 

S 

F 

S 

Bz 
Bz 
Bz 

S 
CI 

18P 

Attached  to  tripping  cranks 

(18N1). 
On  locking  lever  pin  (18BA1 
do 

Connecting  to  pawl 
levers. 

18GA1 
ISFAl 

Tripping  lever  latch,  left. 
Tripping  lever  latch,  right. 

Tripping  lever  stop 

Trough  brackets 

18U 

On  racer 

13D 

On  chassis . 

9K 

Tubes 

In  upper  cylinder  head  (9Q). 
In  shoulder  brackets 

17Y 

do 

To  rest  shoulders 
against. 

14Q 

Tubings 

On  traversing  crank 

12BA 

do 

H14D 

Tubes,  oil 

In  racer 

HUE 

do 

do 

9AA 

Valve  stem  nut 

In  piston  rod  (9BA) 

H12L1 

Washers 

do 

On  pin  (H16K) 

11  Kl 

do 

In  correction  screw 

IIW 

do 

Elevating  handwheel  handle 
Retracting  intermediate 

shaft  gear. 
In  collar 

do 

do... 

Retracting     drum 
shaft. 

do 

On  retracting  shipper  rod . . . 
In  retracting  brake  wheel . . . 

In  retracting  ratchet 

On    traversing    handwheel 

shaft. 
On  traversing  crank 

do 

do 

do 

do 

do 

H18C 

On  traversing  crank  shaft . . . 

With  felt  washer. 

H18D 

do 

Do. 

do 

Traversing  pinion  (H18G)... 
Traversing  clutch  gear 

(H18Q2). 
Traversing  handwheel  shaft 

gear. 
In  washer  (H18C) 

do 

do 

do                   .  . 

do 

In  washer  (H18D) 

do 

Traversing  crank  shaft  gear 

(H18A). 
In  collar  (14C) 

..  ..do 

do 

Retracting  crank 
shaft. 

Retracting  inter- 
mediate shaft. 

Rivpfprl  nn 

do 

....do 

..  .  do 

On  retracting  cranks 

do 

llEA 

...  .do 

On  bolts  (IIR) 

H16J 

....do 

H16B 

...  do 

do 

8B 

....do 

In  lower  end  of  gun  levers . . . 
Outer  dust  guard   . 

H4F 

do 

H13E 

Weight 

For  counterweight  device . . . 

COUNTER  RECOIL  SYSTEM  6-INCH  DISAPPEARING  CARRIAGE,  MODEL  1905  Mn. 


lOD 

4 

lOE 

2 

H7P 

8 

H7M1 

1 

H7L1 

1 

H7D2 

4 

H7Z 

4 

H7J 

2 

H7H1 

2 

H7K 

4 

H7B 

4 

H7A 

4 

H7E 

4 

H7F2 

4 

H7C 

4 

Bolts,  tap. 

do. 

do. 

Buffer  cylinder,  left 

Buffer  cylinder,  right . . 

Buffer  followers 

Buffer  glands 

Buffer  piston  liners 

Buffer  pistons  and  rods. 
Buffer  springs 


Buffer  spring  covers. 
Buffer  spring  rings . . 


Buffer  spring  rods 

Buffer  spring  supports . 

Buffer  stuffing  boxes. . . 


In  clamps  (IOC) 

In  buffer  valve  body 

Buffer  cylinders 

On  chassis 
do 

Buffer  stuffing  boxes  (H7C) . 

Inside  buffer  followers 

On  buffer  pistons 

In  buffer  cylinders 

On  each  side  of  buffer  cylin- 
ders. 

Surrounding  buffer  springs 
(H7K). 

Inside  buffer  spring  covers 
(H7B). 

In  buffer  springs  (H7K) 

On  end  of  buffer  spring  rods 
(H7E). 

In  ends  of  buffer  cylinders , . 


CS  No.  1 
CS  No.  1 
FS  No.  2 
BZNo.3 
BZ  No.  3 
FS  No.  2 


Br 
FS 


FS 
FS 


BZ  No.  3 


0.5  by  1. 
0.75  by  2. 
1.25  by  2.875. 


Riveted  on. 


Seamless  drawn 

tube. 
Provide  a  seat  for 

buffer  spring. 


51 


Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

COUNTER  RECOIL  SYSTEM  6-INCH  DISAPPEARING  CARRIAGE,  MODEL  1905  Mn-Contd. 


Piece 
mark. 


Num- 
ber. 


H7CA1 


H7BA1 
IOC 


H8D 
H7R 

H8C 

H8J 
lOA 

lOB 


H7Q 
H8E 

H8T 


H8K1 


H7AA 


H8G 
H8A1 
H8L 
H8B 
H8H 


Name  of  part. 


Buffer  yoke,  left... 

Buffer  yoke,  right. 
Clamps 


Collars.... 
Couplings. 


Cylmder  plugs . 


Disk. 


Emptying  plug 

Equalizing  and  throttling 
pipes. 

do 


Filling  plugs . 
Followers 


....do 

Gaskets 

....do 

....do 

Gland 

Padlock,  Yale  standard, 
No.  853. 


Location. 


On  buffer  piston  rod . 
....do. 


Inside  front  transom . 


Pipe  connections 

Equalizing   and   throttling 

pipes  to  buffer  valve. 
Buffer  cylinders , 


Material. 


Buffer  valve. 


.do. 


Connects  buffer  cylinders  to 
buffer  valve. 

....do 


Packing  rings. 

....do 

Pins 

....do 

Rings 

Rivets 

Screw  pins  — 

Split  pm 

do 

do 

.....do 


Studs,  with  nuts. 

Taper  pins 

do 


-do. 


Valve  body . . 
Valve  handle. 
Valve  seat — 
Valve  stem... 
"Washer 


Buffer  cylinders , 

Equalizing   and   throttling 

pipes. 
Around  valve  stem  (H8B). . 

Pipe  connections 

Filling  plugs , 

Buffer  stuffing  boxes  (H7C) 
Around  valve  stem  (H8B). . 
Through  hole  in  valve  stem 

(H8B). 


Buffer  valve 

Buffer  cylinders 

Indisk(H8C) 

In  buffer  piston  liners. 

Pipe  connections 

In  valve  stem 

Indisk(H8C) 

In  valve  stem  (H8B).. 

In  taper  pin 

do 

do 


CSNo.l 
CSNo.l 


C 
FSNo.l 


Buffer  cylinders 

Buffer  spring  supports. 
In  buffer  yokes 


.do. 


On  front  transom 

Buffer  valve 

do 

In  valve  body  (H8G). 
do 


Remarks. 


Bz 


BZNo.2 

FSNo.l 
C 


Bz 
BZNo.4 

Bz 
FVF 

FVF 

C 

Bz 

Comm 


GWHP 
GWHP 

Bz 

Bz 

S 
Bz 

S 
S 

s 


BZNo.4 
BZNo.2 
FSNo.2 


Connected  to  buf- 
fer spring  rods. 
Do. 

For  holding  equal- 
izing and  throt- 
tling pipe. 


To  replace  equaliz- 
ing and  throttling 
pipes  to  continue 
piece  in  action 
after  their  injury. 

Graduated  to  indi- 
cate valve  set- 
ting. 

To  empty  counter 
recoil  system. 

Each  piece  approx- 
imately 47  inches 
long. 

Each  piece  approx- 
imately 63  inches 
long. 

Including  2  extra. 

Connect  to  buffer 
cylinder. 


To  prevent  change 
in  setting  of  buf- 
fer valve. 

1  extra. 

4  extra. 

Riveted  in. 
Do. 

0.1875  diameter. 
0.25  by  0.625. 

Buffer  yokes. 

Do. 
For  buffer  spring 

supports. 
1.25  by  4.5. 

Through    piston 

rods. 
Through  spring 

rods 


Seat  for  valve  stem. 
1  shank  BZ  No.  4. 
1  tip  FSNo.l. 


AZIMUTH  POINTER  6-INCH  DISAPPERAING  CARRIAGE,  MODEL  OF  1905  Mn. 


I 


H5P 

1 

H5C1 

1 

H5J 

1 

H5G 

1 

1 

H5A 

1 

2 

H5F 

1 

H5E 

1 

H5S 

1 

1 

H5D 

1 

H5N 

2 

Azimuth  circle j  On  top  of  base  ring 

Azimuth  pointer  body j  In  opening  of  racer 

Collar j  On  screw  (H5K) 

Coaming i  On  racer 

D owel For  scale  ( H5 D ) 

Index I  In  azimuth  point  body. 

Index  marks !  Azimuth  pointer  body . 

Lid !  On  coaming  (H5G). 

Nut -     - 

Pin 

do 

Scale 


Screws do 


On  screw  (H5K). 

In  coaming  ( H5G) 

In  sleeve  (H5L) 

In  azimuth  pointer  body. 


Br 
Bz 
Bz 
CS 

GS 
GS 

GS 
CS 
Bz 

S 

GS 
GS 
Br 


In  6  sections. 
Graduated. 


Attached  to  slide 

(H5R). 
Soldered  on  covers. 
Azimuth  pointer. 
Carries  slide(H5R). 


0.5  by  1.125. 


52 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  markSy 
location,  and  material  of  which  they  are  made — Continued. 

AZIMUTH  POINTER  6-INCH  DISAPPEARING  CARRIAGE,  MODEL  OF  1905  Mii-Contd. 


Piece 
mark. 

Num- 
ber. 

Name  of  part. 

Location. 

Material. 

Remarks. 

H5K 

1 
1 
12 
42 
1 
1 
1 
1 

Screws 

In  azimuth  pointer  body 

In  index  (H5A) 

Bz 

GS 

Br 
GS 
GS 
Bz 

GS 

H5B 

Screw,  countersunk 

.do 

0.25  by  0.625. 
0.5  by  1. 
0.25  by  0.75. 
Graduated 

H5H 

In  coaming  (H5G) 

H5Q 

do 

Sleeve,  left 

In  azimuth  circle 

H5M 

On  screw  (H5K) , 

H5L 

Sleeve,  right          

do.. 

Do 

H5R 

Slide 

In  azimuth  pointer  body 

In  sleeve  (H5M) 

Taper  pin 

ELECTRICAL  EQUIPMENT  6-INCH  DISAPPEARING  CARRLA.GE,  MODEL  1905  Mil. 


T88H 
V27K 
V27W 

V27T 
V27X 
V27H 
V27AA 
E20C 
T91R 

H24E 
V27G 
T91R 


T88F 
E12AA 
E14D 
T24T 
T24S 

T25CK 

T25C 

T25BL1 

T88C 
T88A 
T88B 

T25CH 
T88R 

H24M 

H24H 

T85S 

V23MM 

V23BM 

V23EM 

V23AM 

E12U 


E12X 
E13AJ1 


T85M 
T85U 


Azimuth  lamp  bracket. . . 

Base 

.....do 


Bolts 

Bolts,  expansion. 

Bolts,  tap 

do 

.....do 

....do...: 


.do. 
.do. 
.do. 


....do 

....do 

....do 

....do 

....do 

....do 

....do 

....do 

....do 

....do 

Bolt,  with  nut. 
Bracket 


Bolts,  with  nuts. 
Bracket 


Braces,  lower. 

Braces,  upper. 
Bushing 


-do. 


....do 

On  elbow  (T85Q). 

In  gun  outlet  box . 


Bushing,  1  by  0.5 In  cross  (V23Br) . . 

Bushings,  1  by  0.75 do 

Bushing,  .75  by  0.5 j  In  plug  box  (E20B) . 

Bushings On  0.5  conduit 


In  racer 

In  terminal  box 

Under  condmt  (V27R) . 


For  terminals  (V27S) . 

Inbase(V27W) 

For  terminal  box 

In  strap  (V27Y) 

Inplugbox(E20B).. 
In  strap  (T91E) 


For  braces  (H24H)  (H24M). 

For  terminal  box 

In   straps    (T91L)    (T91E) 

(T91J)     (T91N)     (T91Q) 

(T91C)  (T91G). 

In  bracket  (T88R) 

For  twisted  hooks  (E12Y)... 

For  hook  (E14C) 

Injunction  box  cover  (T24Q) 

In  junction  box  (T24V1) 

In  conduit  support  (T24U). . 
In  shade  support  (T25CJ) . . . 

In  shades  (T25BT2) 

In  junction  box  (T25CB). . . . 

In  brackets  (T88B) 

....do 

In   counterweight   well   on 

piston-rod  beam. 

In  shade  (T25CG) 

On  left  chassis 


.do. 


Bolt,  with  nut >  In  conduit  support  (T24U). . 

Cable,  lighting I  From    plug   connection   to 

lamps  at  sight. 

Cable  thimbles '  On  cable  to  sight 

Candelabra  receptacles '  For   lamps    (E12NA)    and 

(E9H). 
Attached  by  chain  to  elbow 

(T85Q). 
In  plug  casing  (T85L) 


Cap 

Chuck,  in  halves. 


Conduit. 


-do. 
.do. 
.do. 


From  flexible  conduit  in 
counterweight  well  to 
junction  box  (T24V1). 

From  junction  box  (T24V1) 
to  junction  box  (T25CB). 

From  jimction  box  (T2D)  to 
cross  (V23BF). 

From  coupling  (V23BA)  to 
junction  box  (T25CB)  to 
coupling  (V23BA)  at  Cross 
(V23BF). 


Bz 

Slate 

S 

Bz 

S 
S 


s 

Bz 


Comm 

Comm 

Comm 

Comm 

Bz 

S 

c 

GI 
Comm 

Bz 

Bz 

S 


Azimuth  lamp. 

Part  of  conduit 

strap. 
0.25  by  2.125. 

0.625  by  1.75. 
0.625  by  1.125. 
0.25  by  0.875. 
For  carriages  with 

telephone. 
0.625  by  1.5. 

Do. 
0.5  by  1. 


Do. 
0.375  by  0.625. 
0.5  by  1.25. 
0.5  by  0.75. 
0.5  by  1.25. 
0.5  by  1. 
0.5  by  0.875. 
0.5  by  1. 
0.5  by  2.75. 
0.5  by  1. 
0.5  by  1.75. 


0.25  by  0.75. 

To  support  swntch 
(E13AE3). 

For  carriages  with 
telephone. 
Do. 

Part  of  plug  con- 
nection.        |Pi| 

For  carriages  with 
telephone. 


At  buffer  and  re- 
coil valves. 
0.5  by  2. 


Part  of  plug  con- 
nection. 
1  inch  loricated. 


S  Do. 

i 
S         I  Do. 

S        I  0.75  inch  loricated. 

i 


53 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F,  model  of  1905  _Mii,  their  piece  marks, 
location,  and  material  of  which  they  are  mac/e— Continued. 

ELECTRICAL  EQUIPMENT  6-INCH  DISAPPEARING  CARRIAGE,  MODEL   1905  Mu— Contd. 


Piece 
mark. 


V27N 
V27R 
T24U 

V23AA 

V23BA 

V23JA 

E12V 

V23JA 

V27P 

V27C 

V23BF 

T85Q 

V23CL 
V23BJ 

T25BK 
E13P 
V27E 


Num- 
ber. 


Name  of  part. 


E14C 

T88U 

T2D 

T24V1 

T24Q 

T2B 

T25CB 

T24CA 
E12NA 


E20A 


E9H 
E13AK 

E13AL 

E13W1 

E9B1 

E9G1 

E12Q1 


Conduit. 


.do. 


.do. 


Conduit,  in  two  pieces. 
do 


Conduit  fittings 

Conduit,  flexible  metallic. 
Conduit  support 


Couplings,  0.5. . 
Couplings,  0.75. 
Couplings,! — 
Couplings,  0.5. . 


Couplings,!... 

Coupling  nuts. 

Cover 

Crosses,! 


Elbow. 


Elbows, side  outlet. 
Elbow,  0.75  90° 


Location. 


From    cross    (V23BF)    to 
coupling  (V23BA)  on  left 

From  elbow  (V23CL)  to  tee 

(V23AE)  on  left  chassis. 
From  coupling  (V23BA)  at 

junction  box   (T24V)   to 

coupling  (V23B  A). 
From  cross  (V23BF)  into 

racer. 
From  coupling  (V23AA)  on 

front  transom  to  coupling 

(E!2U)    on    piston    rod 

bracket. 
From  coupling  (V23AA)  to 

plug  connection  on  sight 

standard. 
From  coupling  (V23AA)  at 

junction  box  (T25CB)  to 

!6-candlepower  lamp   on 

rear  transom. 
From  coupling  (V23AA)  to 

coupling  (E!2V)  near  ele- 
vation disk  lamp. 
From  tee  (V23AC)  on  left 

chassis  to  tee  (V23AC)  on 

front  transom. 
From  junction  box  (T25CA) 

topiugbox(E20B). 
From  tee  (V23AE)  to  tee 

(V23AC)  on  left  chassis. 

On  conduit  (V27R) 

In  counterweight  well 

On  piston  rod  bracket 

(HISG). 

On  0.5  conduit 

On  0.75  conduit 

On  1  conduit 

On  0.5  conduit 


On  !  conduit. 


Gasket 

do 

do 

Gun  outlet  box. 


On  conduit  (V27R) , 

For  terminal  box 

On  left  chassis  and  under- 
neath right  chassis. 

On  0.5  conduit  on  sight 
standard. 

On  left  chassis 

Inside  rear  transom  near 
junction  box  (T25CB). 

For  junction  box  (T25CB).. 

For  switch  (E13AE3) , 

For  terminal  box , 

Onleft  chassis — 


Hook I  On  right  chassis 

Insulation  tube I  Inracernearazimuth pointer 

Junction  box I  On  left  chassis , 

do 1  LTnder  right  chassis 

Junction  box  cover !  For  jimction  box  (T24V!) . . , 

do For  junction  box  (T2D) 

Junction  box  and  cover. . .    On  racerinfront  of  rear  tran- 
som. 

do On  right  chassis , 

Lamps ,  candelabra At  elevation  scale,  azimuth 

pointer  and  buffer  and  re- 
coil valves. 
Hung  from  right  chassis 


Lamp  and  cable,  portable. 


Lamps,  2-candlepower |  At  telescopic  sight 

Lamps,  l&-candlepower...j  At  right  and  left  chassis  and 
I     inside  rear  transom. 

do I do 

Lamp  fitting For  switch  (E13AE3) 

Lamp  holders For  lamps  (E9H) 

Lamp  holder  springs I  On  lamp  holders  (E9B!) 

Lamp  springs j  For  lamps  (E12NA) 


Material. 

Remarks. 

s 

0.75  inch  loricated. 

S 

Do. 

-S 

Do. 

s 

0.5  inch  loricated. 

s 

Do. 

s 
s 

Bz 

S 

s 

Comm 

Comm 

Comm 

Bz 

Comm 

Bz 

CI 

Comm 

Bz 

Comm 
Comm 

SR 
SR 
GP 


Bz 
HR 
CI 
CI 
CI 
CI 
CI 

CI 
Comm 


Comm 
Comm 

Comm 

CI 

Bz 

Br 
PhBz 


Do. 


Do. 

Do. 

Do. 
Do. 


Right  and  left. 
Do. 
Do. 
At  elevation  scale 

lamp. 
For  carriages  with 
telephone. 


Part  of  plug  con- 
nection. 


Fiu-nished  by  Sig- 
nal Corps. 
For  portable  lamp. 


8  candlepower. 

Furnished  by  En- 
gineer  Depart- 
ment. 

For  110- volt  main. 

For  220-volt  main. 


54 

Names  of  parts  of  G-inch  disappearing  carriage,  L.  F ,  model  of  1905  Mil,  their  piece  marks ^ 
location,  and  material  of  which  they  are  made — Continued. 

ELECTRICAL  EQUIPMENT  6-INCH  DISAPPEARING  CARRIAGE,  MODEL  1905  Mn— Contd. 


Piece 
mark. 


Num- 
ber. 


Name  of  part. 


Location. 


I  Material, 


V23AU 
V23KU 
V23LT 

V23UT 
V23MT 
V23AT 

V23BT 


V23HT 
V23HT 

V23FT 

V23GT 

E12T1 

E13H 
V27V 
E12T1 

V27D 

V27Q 
V23B 
V23C 

V23A 

V27L 


V27Z 

T85AA 

E20B 

T85L 

T85W 
E12P2 
T25BM 
T88J 
V27B 
V27M 

T25BM 
T85V 

T25CG 

T25BT2 

T25CJ 
T25BY 
T85BA 

E13AF 
E13AH 

E13AG 
T85X 

T91L 

T91J 

T91N 
T91Q 


Nipple,  2.5  long. 
Nipple,  3  long. . . 
Nipples,  close... 


do 

do 

Nipples,  short. 


.do. 


....do 

Nipple,  short.. 

Nipples,  short. 


Nuts. 


do 

....do 

..-.do 

Pad 

Pins 

Pipe  fittings 

Pipe  plugs,  0.75. 
Pipe  plugs,  1 

Pipe  plugs,  0.5. . 

Plate 


Plates,  marking. . 


.do. 


Socket  holders.. 
Socket  insulator. 

Straps 

do 

do 

do 


Intee(V23AC) 

Intee(V23JC) 

In  tee  ( V23AC)  and  junction . 
box  (T25CA). 

In  elbow  (V23CL) 

Intee(V23JC) 

In  tees  (V23AE)  and  junc- 
tion boxes  (T2D)  (T25CB). 

In  elbows  (V23BJ)  and 
(V23CL)  andcross 
(V23BF). 

In  Junction  box  (T24V1) 

In  bushing  (V23MM) 


In  junction  box  (T2D)  and 
in  coupling  (V23AA). 

In  cross  (V23BF)  and  tees 
(V23.TC). 

Part  of  fittings  of  lamps 
(E12NA). 

For  switch  (E13AE3) 

On  bolts  (V27T) 

On  bushing  (T85S) 


For  terminal  box 

In  pipe  fitting  (V27Q) 

On  conduit  (V27R) 

In  tees  (V23JC)  (V23AE). . . . 

In  cross  (V23BF)  and  ter- 
minal box. 

In  junction  box  (T25AC) 
and  tees  (V23AC). 

For  terminal  box 


Comm 
Comm 
Comm 

Comm 
Comm 
Comm 

Comm 


Comm 
Comm 

Comm 

Comm 

Bz 

Bz 
Bz 
Bz 

SR 
S 

Bz 
Comm 


...do. 


Plugs 

Plug  box 

Plug  casing 

Plug  insulator 

Reflectors 

Screws 

Screws,  fillister  head 

Screws,  round  head 

do 

do 

do , 

Separator 

Shade 

Shades,  complete , 

Shade  support 

Sleeves , 

Sockets , 


On  wire  inside  plug  insula- 
tor (T85W). 

On  right  chassis  for  portable 
lamp. 

Innut(E12Tl) 


Comm 
Br 


Br 
Bz 


Bz 


In  plug  casing  (T85L) !     HR 


For  lamps  (E12NA) 

In  junction  box  (T25CA). . . . 

In  azimuth  lamp  bracket . . . 

For  terminal  ])ox 

For  plate  ( V27L) 

Injunction-box  cover  (T2B). 
In  junction  box  (T25CB). . . . 
In  plug  casing  (T85L) 


For  lamp  inside  rear  transom 
On  right  and  left  chassis 


On  rear  transom 

Under  junction  box  (T25CB) 

On  wires  inside  socket  insu- 
lator. 

For  16-candle  power  lamps . . 

Attached  to  candelabra  re- 
ceptacle (E13AJ1). 

For  16-candle  power  lamps. . 

In  bushing  (T85S) 


On    0.75    conduit    on    left 

chassis. 
On  1-inch  conduit  on  right 

guide  frame. 
On  0.5  conduit  on  left  chassis. 
On    0.5    conduit    on    front 

transom. 


Br 

S 

s 

Bz 
Br 

S 

S 

HR 


S 

CI 
Bz 

Comm 
Bz 

Bz 
HR 


Insulation  lined. 

Do. 
Right  and  left. 
Insulation  lined. 

Do. 


Right  and  left. 
For  carriages  with 

telephone. 
Right  and  left. 


Do. 


Part  of  plug  con 
nection. 


Commercial. 


Marked  Ordnance 
Department 
"wires"  and 
Signal  Corps 
"wires." 

Marked  "L,""P," 
or  "T." 

Part  of  plug  con- 
nection. 

Furnished  by  En- 
gineer Depart- 
ment. 

Part  of  plug  con- 
nection. 
Do. 

0.25  by  0.5. 

0.375  by  1.25. 

0.375  by  1. 

0.1875  by  0.375. 

0.25  by  0.75. 

0.25  by  0.5. 

Part  of  plug  con- 
nection. 

Ends  riveted  in  by 
0.25  rivets. 

Pro\ided  with 
thumb  nuts. 

Forshade(T25CG). 

Part  of  plug  con- 
nection. 

For     lamps 

(E12NA). 

Part  of  plug  con- 
nection. 


55 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  marks, 
Location,  and  material  of  which  they  are  made — Continued. 

ELECTRICAL  EQUIPMENT  6-INCH  DISAPPEARING  CARRIAGE,  MODEL  1905  Mn— Contd. 


Piece     Num- 
mark.      ber. 


Name  of  part. 


Location. 


Material. 


Remarks. 


T91G 

T91C 
T91E 
V27Y 
T91E 

E13M 

E13H 
E13J2 
E13A1 
E13Q1 
E13AE3 

T85T 

V23AC 

V23HC 

V23AE 


V27S 

12 

V27A 

1 

V27J 

1 

E12Y 

2 

E12Z 

2 

V27F 

2 

V27U 

12 

T85Y 

1 

Straps. 


-do. 
-do. 
-do. 
-do. 


Switch  button,  complete . 

Switch  cover 

Switch  key 

Switch,  Perkins  No.  2220. 

Switch,  Russell 

Switch,  watertight,  com- 
plete. 
Taper  sleeve 


Tees,  0.5 

Tees,  0.75 

Tees,  reducing,  0.75  to  0.5. 
Telephone 


Terminals 

Terminal  box 

Terminal-box  fitting . 

Twisted  hooks 

"Washers 

....do 

....do 

....do 


Wire,  200  feet . 


On  0.75  conduit  on  inside 

right  chassis. 

For  0.5  conduit 

On  1-ineh  conduit  on  racer . . 

On  conduit  (V27R) 

On  1-inch  conduit  from  gun 

outlet  box. 

For  switch  (E13AE3) 

Part  of  switch  (E13.\E3) . . . . 

For  swit-ch  (E13AE3) 

Inside  switch  (E13AE3) 

On  left  chassis. 

....do 


In  plug  casmg  (T85L) 

On  0.5  conduit  on  left  chassis 

and  front  transom. 
On  0.75  conduit   on  right 

chassis. 
On  front  transom  and  left 

chassis. 
On  left  chassis 


For  terminal  box 

U  nder  base  ring 

On  conduit  at  terminal  box. 
For  holding  cable  thimbles. . 
For  twisted  hooks  (E12Y)... 

For  terminal  box 

Onbolts(V27T) 

In  elbow  (T85Q) 

In  conduit  for  lighting  circuit 


rVFand 

Bz 

Bz 
Comm 
Comm 


Bz 
Comm 
Comm 
Comm 
Comm 


C 
CI 
Bz 

S 

s 

Bz 
Bz 
HR 


For  carriage  with 
telephone. 


For  elevating  scale 
lamp. 

Part  of  plug  con- 
nection. 


Furmshed  by  Sig- 
nal Corps,  car- 
riage No.  20  and 
above  not  equip- 
ped with  tele- 
phone. 


Part  of  plug  con- 
nection. 
Insulated. 


SHOT  TRUCKS  (4  PER  CARRIAGE),  6-INCH  DISAPPEARING  CARRIAGE,  MODEL  1905  Mn. 


AIL 

AIT 

AlU 

AlK 

AIJ 
AlP 

AlCl 
AIX 
AIS 


AIR 
AlB 
AlE 
AIQ 

Q3C 
AlF 


AlH 


Angles . 


....do 

--..do 

Angles,  left . 

Angles,  right 
AxU  ' 


e  brackets,  main. 


Axle,  main  wheel. 
Bolts,  with  nuts. . 
Braces,  left 


Braces,  right 

Bushings 

do 

Handle 

Nuts,  crown 

Oil  phigs,  0.375  standard. 
Pins,  caster  wheel 


Rivets 

Rivets,  round  head. 
do 


Bolted    above    main    axle 
brackets  (AlP). 

Join  angles  (AIJ)  and  (AlK) 

at  top  of  truck. 
Join  angles  (AIJ)  and  (AlK) 

above  caster  wheels. 
Front     and    rear    vertical 

frames. 

do 

At  middle  of  truck 


Shot  support,  left Top  of  truck 


On  main  axle  brackets  (AlP) 

In  main  axle  brackets  (AlP). 

Join  front  and  rear  vertical 
frames  to  main  axle  brack- 
ets. 

do 

Main  wheels  ( AlA) 

Caster  wheels  (AID) 

Rear  end  of  truck 

On  main  wheel  axle 

In  wheel 

Supported  in  bearing  in 
lower  end  of  angles  (AIJ) 
and  (AlK). 

For  handle 

Angles  ( Al)  to  shot  supports. 

At  various  joints 


S 

cs 

FS 
S 

S 


s 

Bz 
Bz 

Ash 
S 
Bz 

S 


1.75  by  1.75  by 
0.1875  inches,  an- 
gles. 

1.5  by  1.5  by  0.1875 
inches,  angles. 
Do. 

Do. 

Do. 
Bolted       between 

(AIL). 


0.5  bv  1.625. 
1.5  by  1.5  by  0.1875 
inches,  angles. 

Do. 


0.25-inch  diameter. 
0.5-inch  diameter. 
0.375-inch       diam- 

2  by  2  by  0.25-inch 
angle. 


56 

Names  of  parts  of  6-inch  disappearing  carriage,  L.  F.,  model  of  1905  Mil,  their  piece  marks, 
location,  and  material  of  which  they  are  made — Continued. 

SHOT   TRUCKS   (4  PER  CARRIAGE),  6-INCH   DISAPPEARING  CARRIAGE,  MODEL    OF 

1905  Mil— Continued. 


Piece 
mark. 

Num- 
ber. 

Name  of  part. 

Location. 

Material. 

Remarks 

AIG 

1 

2 
2 
2 

1 
1 
2 
2 
2 
2 
2 

2 

Shot  support,  right 

Top  of  truck 

S 

S 
S 

s 
s 
s 
s 

VR 
VR 

s 
cs 

CS 

2   by    2    by    0.25- 
inch  angle. 

In  caster  wheel  pins 

do 

do 

In  crown  nuts 

On  main  axle 

AIN 

Stop,  left 

AIM 

Stop   right      .  . 

do         

In  main  axle  brackets 

Caster  wheels 

AlW 

Tires     .':':::':":':':': 

AlV 

do 

Washers     

AID 

On  caster  wheel  pins.   Front 

and  rear  of  truck. 
On  main  axle       

AlA 

Wheels  main 

SHOT  TONGS,  MODEL  OF  1904  (7  PER  CARRIAGE) 


A8N1 

ASP 

ASS 

AST 

A8Q 

3 

2 

A8R 

1 

2 

2 

1 

1 

Claw,  inner . 
Claw,  outer. 

Dog 

Pin,  center. . 
Pin,  shackle. 

Separators. . 

....do 


Shackle... 
Split  pins . 

do 

Spreader . . 
do 


Opposite  outer  claw  (ASP) . . 
Pivoted  on  center  pin  (AST) .  { 

do 

For  pivot  of  claws  and  dog . . . ; 
In  upper  of  extremity  of 

outer  claw.  j 

Between  2  parts  of  inner  j 

claw.  I 

Between  2  parts   of  outer 

claw.  j 

On  shackle  pin  (ASQ) ! 

In  shackle  pin i 

In  center  pm ! 

In  iimer  claw  ( A8N1) i 

In  outer  claw  (ASP) 1 


In  two  parts. 
Do. 


Riveted  to  claw. 


Do. 
Do. 


GREASE  CUPS  (10  PER  CARRIAGE)  6-INCH  DISAPPEARING  CARRIAGE,  MODEL 

1905  Mil. 


A2A 

A2B 

A2D1 


A2E1 
A2G 
A2H 


A2F 
A2C1 


Body 

Cap 

Cup,  leather 
Gaskets 

Pin 

Plunger.... 
Plunger  nut 
Screw 

SpUt  pin  — 

Spring 

Washer 


Screwed  into  carriage j  Bz 

Onupperendofbody(A2A).|  Bz 

Underneath  plunger Leather . 

Between  body  (A2A)  and  C 

oil  pipe  when  grease  cup 

is  seated. 

In  plunger Bz 

Inside  grease  cup Bz 

Secures  plungertocap(A2B).  Bz 

Secures     cup     leather     to  *  Bz 

plunger.  ] 

In  plunger  nut j  S 

Between  cap  and  plunger ...  1  S 

Under  cup  leather :  Bz 


0.125  by  0.5  driven. 


5  coils. 


War  Department, 

Office  of  the  Chief  of  Ordnance, 

Washington,  January  14,  1914. 

Form  No.  1711. 

Ed.  Aug.  24-17—1,000.  . 


*-J..«..4l  \  I 


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Gaylord  Bros. 

Makers 
Syracuse,  N.Y. 

PIT.  m  21  >is<« 


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